Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/boltons/iterutils.py @ 0:26e78fe6e8c4 draft

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"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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0
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1 # -*- coding: utf-8 -*-
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2 """:mod:`itertools` is full of great examples of Python generator
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3 usage. However, there are still some critical gaps. ``iterutils``
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4 fills many of those gaps with featureful, tested, and Pythonic
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5 solutions.
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6
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7 Many of the functions below have two versions, one which
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8 returns an iterator (denoted by the ``*_iter`` naming pattern), and a
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9 shorter-named convenience form that returns a list. Some of the
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10 following are based on examples in itertools docs.
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11 """
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12
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13 import os
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14 import math
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15 import time
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16 import codecs
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17 import random
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18 import socket
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19 import hashlib
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20 import itertools
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21
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22 try:
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23 from collections.abc import Mapping, Sequence, Set, ItemsView, Iterable
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24 except ImportError:
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25 from collections import Mapping, Sequence, Set, ItemsView, Iterable
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26
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27
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28 try:
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29 from typeutils import make_sentinel
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30 _UNSET = make_sentinel('_UNSET')
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31 _REMAP_EXIT = make_sentinel('_REMAP_EXIT')
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32 except ImportError:
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33 _REMAP_EXIT = object()
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34 _UNSET = object()
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35
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36 try:
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37 from future_builtins import filter
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38 from itertools import izip
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39 _IS_PY3 = False
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40 except ImportError:
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41 # Python 3 compat
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42 _IS_PY3 = True
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43 basestring = (str, bytes)
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44 unicode = str
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45 izip, xrange = zip, range
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46
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47
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48 def is_iterable(obj):
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49 """Similar in nature to :func:`callable`, ``is_iterable`` returns
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50 ``True`` if an object is `iterable`_, ``False`` if not.
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51
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52 >>> is_iterable([])
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53 True
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54 >>> is_iterable(object())
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55 False
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56
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57 .. _iterable: https://docs.python.org/2/glossary.html#term-iterable
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58 """
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59 try:
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60 iter(obj)
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61 except TypeError:
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62 return False
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63 return True
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64
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65
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66 def is_scalar(obj):
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67 """A near-mirror of :func:`is_iterable`. Returns ``False`` if an
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68 object is an iterable container type. Strings are considered
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69 scalar as well, because strings are more often treated as whole
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70 values as opposed to iterables of 1-character substrings.
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71
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72 >>> is_scalar(object())
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73 True
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74 >>> is_scalar(range(10))
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75 False
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76 >>> is_scalar('hello')
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77 True
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78 """
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79 return not is_iterable(obj) or isinstance(obj, basestring)
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80
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81
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82 def is_collection(obj):
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83 """The opposite of :func:`is_scalar`. Returns ``True`` if an object
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84 is an iterable other than a string.
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85
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86 >>> is_collection(object())
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87 False
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88 >>> is_collection(range(10))
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89 True
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90 >>> is_collection('hello')
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91 False
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92 """
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93 return is_iterable(obj) and not isinstance(obj, basestring)
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94
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95
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96 def split(src, sep=None, maxsplit=None):
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97 """Splits an iterable based on a separator. Like :meth:`str.split`,
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98 but for all iterables. Returns a list of lists.
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99
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100 >>> split(['hi', 'hello', None, None, 'sup', None, 'soap', None])
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101 [['hi', 'hello'], ['sup'], ['soap']]
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102
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103 See :func:`split_iter` docs for more info.
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104 """
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105 return list(split_iter(src, sep, maxsplit))
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106
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107
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108 def split_iter(src, sep=None, maxsplit=None):
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109 """Splits an iterable based on a separator, *sep*, a max of
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110 *maxsplit* times (no max by default). *sep* can be:
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111
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112 * a single value
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113 * an iterable of separators
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114 * a single-argument callable that returns True when a separator is
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115 encountered
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116
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117 ``split_iter()`` yields lists of non-separator values. A separator will
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118 never appear in the output.
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119
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120 >>> list(split_iter(['hi', 'hello', None, None, 'sup', None, 'soap', None]))
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121 [['hi', 'hello'], ['sup'], ['soap']]
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122
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123 Note that ``split_iter`` is based on :func:`str.split`, so if
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124 *sep* is ``None``, ``split()`` **groups** separators. If empty lists
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125 are desired between two contiguous ``None`` values, simply use
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126 ``sep=[None]``:
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127
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128 >>> list(split_iter(['hi', 'hello', None, None, 'sup', None]))
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129 [['hi', 'hello'], ['sup']]
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130 >>> list(split_iter(['hi', 'hello', None, None, 'sup', None], sep=[None]))
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131 [['hi', 'hello'], [], ['sup'], []]
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132
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133 Using a callable separator:
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134
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135 >>> falsy_sep = lambda x: not x
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136 >>> list(split_iter(['hi', 'hello', None, '', 'sup', False], falsy_sep))
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137 [['hi', 'hello'], [], ['sup'], []]
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138
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139 See :func:`split` for a list-returning version.
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140
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141 """
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142 if not is_iterable(src):
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143 raise TypeError('expected an iterable')
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144
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145 if maxsplit is not None:
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146 maxsplit = int(maxsplit)
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147 if maxsplit == 0:
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148 yield [src]
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149 return
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150
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151 if callable(sep):
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152 sep_func = sep
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153 elif not is_scalar(sep):
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154 sep = frozenset(sep)
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155 sep_func = lambda x: x in sep
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156 else:
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157 sep_func = lambda x: x == sep
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158
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159 cur_group = []
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160 split_count = 0
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161 for s in src:
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162 if maxsplit is not None and split_count >= maxsplit:
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163 sep_func = lambda x: False
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164 if sep_func(s):
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165 if sep is None and not cur_group:
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166 # If sep is none, str.split() "groups" separators
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167 # check the str.split() docs for more info
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168 continue
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169 split_count += 1
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170 yield cur_group
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171 cur_group = []
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172 else:
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173 cur_group.append(s)
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174
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175 if cur_group or sep is not None:
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176 yield cur_group
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177 return
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178
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179
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180 def chunked(src, size, count=None, **kw):
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181 """Returns a list of *count* chunks, each with *size* elements,
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182 generated from iterable *src*. If *src* is not evenly divisible by
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183 *size*, the final chunk will have fewer than *size* elements.
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184 Provide the *fill* keyword argument to provide a pad value and
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185 enable padding, otherwise no padding will take place.
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186
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187 >>> chunked(range(10), 3)
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188 [[0, 1, 2], [3, 4, 5], [6, 7, 8], [9]]
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189 >>> chunked(range(10), 3, fill=None)
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190 [[0, 1, 2], [3, 4, 5], [6, 7, 8], [9, None, None]]
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191 >>> chunked(range(10), 3, count=2)
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192 [[0, 1, 2], [3, 4, 5]]
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193
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194 See :func:`chunked_iter` for more info.
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195 """
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196 chunk_iter = chunked_iter(src, size, **kw)
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197 if count is None:
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198 return list(chunk_iter)
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199 else:
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200 return list(itertools.islice(chunk_iter, count))
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201
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202
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203 def chunked_iter(src, size, **kw):
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204 """Generates *size*-sized chunks from *src* iterable. Unless the
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205 optional *fill* keyword argument is provided, iterables not evenly
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206 divisible by *size* will have a final chunk that is smaller than
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207 *size*.
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208
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209 >>> list(chunked_iter(range(10), 3))
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210 [[0, 1, 2], [3, 4, 5], [6, 7, 8], [9]]
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211 >>> list(chunked_iter(range(10), 3, fill=None))
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212 [[0, 1, 2], [3, 4, 5], [6, 7, 8], [9, None, None]]
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213
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214 Note that ``fill=None`` in fact uses ``None`` as the fill value.
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215 """
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216 # TODO: add count kwarg?
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217 if not is_iterable(src):
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218 raise TypeError('expected an iterable')
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219 size = int(size)
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220 if size <= 0:
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221 raise ValueError('expected a positive integer chunk size')
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222 do_fill = True
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223 try:
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224 fill_val = kw.pop('fill')
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225 except KeyError:
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226 do_fill = False
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227 fill_val = None
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228 if kw:
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229 raise ValueError('got unexpected keyword arguments: %r' % kw.keys())
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230 if not src:
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231 return
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232 postprocess = lambda chk: chk
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233 if isinstance(src, basestring):
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234 postprocess = lambda chk, _sep=type(src)(): _sep.join(chk)
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235 if _IS_PY3 and isinstance(src, bytes):
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236 postprocess = lambda chk: bytes(chk)
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237 src_iter = iter(src)
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238 while True:
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239 cur_chunk = list(itertools.islice(src_iter, size))
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240 if not cur_chunk:
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241 break
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242 lc = len(cur_chunk)
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243 if lc < size and do_fill:
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244 cur_chunk[lc:] = [fill_val] * (size - lc)
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245 yield postprocess(cur_chunk)
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246 return
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247
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248
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249 def pairwise(src):
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250 """Convenience function for calling :func:`windowed` on *src*, with
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251 *size* set to 2.
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252
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253 >>> pairwise(range(5))
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254 [(0, 1), (1, 2), (2, 3), (3, 4)]
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255 >>> pairwise([])
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256 []
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257
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258 The number of pairs is always one less than the number of elements
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259 in the iterable passed in, except on empty inputs, which returns
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260 an empty list.
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261 """
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262 return windowed(src, 2)
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263
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264
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265 def pairwise_iter(src):
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266 """Convenience function for calling :func:`windowed_iter` on *src*,
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267 with *size* set to 2.
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268
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269 >>> list(pairwise_iter(range(5)))
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270 [(0, 1), (1, 2), (2, 3), (3, 4)]
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271 >>> list(pairwise_iter([]))
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272 []
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273
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274 The number of pairs is always one less than the number of elements
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275 in the iterable passed in, or zero, when *src* is empty.
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276
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277 """
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278 return windowed_iter(src, 2)
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279
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280
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281 def windowed(src, size):
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282 """Returns tuples with exactly length *size*. If the iterable is
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283 too short to make a window of length *size*, no tuples are
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284 returned. See :func:`windowed_iter` for more.
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285 """
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286 return list(windowed_iter(src, size))
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287
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288
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289 def windowed_iter(src, size):
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290 """Returns tuples with length *size* which represent a sliding
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291 window over iterable *src*.
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292
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293 >>> list(windowed_iter(range(7), 3))
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294 [(0, 1, 2), (1, 2, 3), (2, 3, 4), (3, 4, 5), (4, 5, 6)]
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295
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296 If the iterable is too short to make a window of length *size*,
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297 then no window tuples are returned.
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298
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299 >>> list(windowed_iter(range(3), 5))
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300 []
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301 """
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302 # TODO: lists? (for consistency)
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303 tees = itertools.tee(src, size)
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304 try:
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305 for i, t in enumerate(tees):
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306 for _ in xrange(i):
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307 next(t)
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308 except StopIteration:
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309 return izip([])
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310 return izip(*tees)
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311
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312
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313 def xfrange(stop, start=None, step=1.0):
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314 """Same as :func:`frange`, but generator-based instead of returning a
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315 list.
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316
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317 >>> tuple(xfrange(1, 3, step=0.75))
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318 (1.0, 1.75, 2.5)
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319
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320 See :func:`frange` for more details.
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321 """
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322 if not step:
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323 raise ValueError('step must be non-zero')
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324 if start is None:
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325 start, stop = 0.0, stop * 1.0
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326 else:
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327 # swap when all args are used
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328 stop, start = start * 1.0, stop * 1.0
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329 cur = start
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330 while cur < stop:
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331 yield cur
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332 cur += step
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333
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334
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335 def frange(stop, start=None, step=1.0):
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336 """A :func:`range` clone for float-based ranges.
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337
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338 >>> frange(5)
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339 [0.0, 1.0, 2.0, 3.0, 4.0]
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340 >>> frange(6, step=1.25)
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341 [0.0, 1.25, 2.5, 3.75, 5.0]
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342 >>> frange(100.5, 101.5, 0.25)
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343 [100.5, 100.75, 101.0, 101.25]
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344 >>> frange(5, 0)
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345 []
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346 >>> frange(5, 0, step=-1.25)
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347 [5.0, 3.75, 2.5, 1.25]
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348 """
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349 if not step:
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350 raise ValueError('step must be non-zero')
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351 if start is None:
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352 start, stop = 0.0, stop * 1.0
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353 else:
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354 # swap when all args are used
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355 stop, start = start * 1.0, stop * 1.0
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356 count = int(math.ceil((stop - start) / step))
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357 ret = [None] * count
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358 if not ret:
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359 return ret
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360 ret[0] = start
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361 for i in xrange(1, count):
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362 ret[i] = ret[i - 1] + step
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363 return ret
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364
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365
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366 def backoff(start, stop, count=None, factor=2.0, jitter=False):
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367 """Returns a list of geometrically-increasing floating-point numbers,
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368 suitable for usage with `exponential backoff`_. Exactly like
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369 :func:`backoff_iter`, but without the ``'repeat'`` option for
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370 *count*. See :func:`backoff_iter` for more details.
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371
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372 .. _exponential backoff: https://en.wikipedia.org/wiki/Exponential_backoff
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373
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374 >>> backoff(1, 10)
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375 [1.0, 2.0, 4.0, 8.0, 10.0]
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376 """
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377 if count == 'repeat':
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378 raise ValueError("'repeat' supported in backoff_iter, not backoff")
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379 return list(backoff_iter(start, stop, count=count,
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380 factor=factor, jitter=jitter))
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381
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382
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383 def backoff_iter(start, stop, count=None, factor=2.0, jitter=False):
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384 """Generates a sequence of geometrically-increasing floats, suitable
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385 for usage with `exponential backoff`_. Starts with *start*,
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386 increasing by *factor* until *stop* is reached, optionally
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387 stopping iteration once *count* numbers are yielded. *factor*
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388 defaults to 2. In general retrying with properly-configured
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389 backoff creates a better-behaved component for a larger service
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390 ecosystem.
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391
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392 .. _exponential backoff: https://en.wikipedia.org/wiki/Exponential_backoff
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393
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394 >>> list(backoff_iter(1.0, 10.0, count=5))
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395 [1.0, 2.0, 4.0, 8.0, 10.0]
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396 >>> list(backoff_iter(1.0, 10.0, count=8))
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397 [1.0, 2.0, 4.0, 8.0, 10.0, 10.0, 10.0, 10.0]
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398 >>> list(backoff_iter(0.25, 100.0, factor=10))
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399 [0.25, 2.5, 25.0, 100.0]
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400
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401 A simplified usage example:
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402
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403 .. code-block:: python
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404
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405 for timeout in backoff_iter(0.25, 5.0):
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406 try:
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407 res = network_call()
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408 break
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409 except Exception as e:
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410 log(e)
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411 time.sleep(timeout)
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412
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413 An enhancement for large-scale systems would be to add variation,
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414 or *jitter*, to timeout values. This is done to avoid a thundering
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415 herd on the receiving end of the network call.
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416
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417 Finally, for *count*, the special value ``'repeat'`` can be passed to
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418 continue yielding indefinitely.
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419
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420 Args:
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421
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422 start (float): Positive number for baseline.
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423 stop (float): Positive number for maximum.
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424 count (int): Number of steps before stopping
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425 iteration. Defaults to the number of steps between *start* and
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426 *stop*. Pass the string, `'repeat'`, to continue iteration
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427 indefinitely.
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428 factor (float): Rate of exponential increase. Defaults to `2.0`,
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429 e.g., `[1, 2, 4, 8, 16]`.
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430 jitter (float): A factor between `-1.0` and `1.0`, used to
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431 uniformly randomize and thus spread out timeouts in a distributed
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432 system, avoiding rhythm effects. Positive values use the base
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433 backoff curve as a maximum, negative values use the curve as a
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434 minimum. Set to 1.0 or `True` for a jitter approximating
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435 Ethernet's time-tested backoff solution. Defaults to `False`.
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436
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437 """
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438 start = float(start)
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439 stop = float(stop)
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440 factor = float(factor)
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441 if start < 0.0:
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442 raise ValueError('expected start >= 0, not %r' % start)
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443 if factor < 1.0:
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444 raise ValueError('expected factor >= 1.0, not %r' % factor)
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445 if stop == 0.0:
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446 raise ValueError('expected stop >= 0')
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447 if stop < start:
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448 raise ValueError('expected stop >= start, not %r' % stop)
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449 if count is None:
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450 denom = start if start else 1
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451 count = 1 + math.ceil(math.log(stop/denom, factor))
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452 count = count if start else count + 1
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453 if count != 'repeat' and count < 0:
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454 raise ValueError('count must be positive or "repeat", not %r' % count)
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455 if jitter:
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456 jitter = float(jitter)
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457 if not (-1.0 <= jitter <= 1.0):
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458 raise ValueError('expected jitter -1 <= j <= 1, not: %r' % jitter)
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459
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460 cur, i = start, 0
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461 while count == 'repeat' or i < count:
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462 if not jitter:
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463 cur_ret = cur
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464 elif jitter:
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465 cur_ret = cur - (cur * jitter * random.random())
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466 yield cur_ret
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467 i += 1
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468 if cur == 0:
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469 cur = 1
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470 elif cur < stop:
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471 cur *= factor
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472 if cur > stop:
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473 cur = stop
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474 return
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475
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476
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477 def bucketize(src, key=bool, value_transform=None, key_filter=None):
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478 """Group values in the *src* iterable by the value returned by *key*.
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479
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480 >>> bucketize(range(5))
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481 {False: [0], True: [1, 2, 3, 4]}
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482 >>> is_odd = lambda x: x % 2 == 1
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483 >>> bucketize(range(5), is_odd)
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484 {False: [0, 2, 4], True: [1, 3]}
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485
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486 *key* is :class:`bool` by default, but can either be a callable or a string
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487 name of the attribute on which to bucketize objects.
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488
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489 >>> bucketize([1+1j, 2+2j, 1, 2], key='real')
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490 {1.0: [(1+1j), 1], 2.0: [(2+2j), 2]}
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491
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492 Value lists are not deduplicated:
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493
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494 >>> bucketize([None, None, None, 'hello'])
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495 {False: [None, None, None], True: ['hello']}
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496
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497 Bucketize into more than 3 groups
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498
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499 >>> bucketize(range(10), lambda x: x % 3)
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500 {0: [0, 3, 6, 9], 1: [1, 4, 7], 2: [2, 5, 8]}
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501
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502 ``bucketize`` has a couple of advanced options useful in certain
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503 cases. *value_transform* can be used to modify values as they are
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504 added to buckets, and *key_filter* will allow excluding certain
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505 buckets from being collected.
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506
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507 >>> bucketize(range(5), value_transform=lambda x: x*x)
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508 {False: [0], True: [1, 4, 9, 16]}
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509
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510 >>> bucketize(range(10), key=lambda x: x % 3, key_filter=lambda k: k % 3 != 1)
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511 {0: [0, 3, 6, 9], 2: [2, 5, 8]}
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512
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513 Note in some of these examples there were at most two keys, ``True`` and
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514 ``False``, and each key present has a list with at least one
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515 item. See :func:`partition` for a version specialized for binary
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516 use cases.
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517
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518 """
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519 if not is_iterable(src):
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520 raise TypeError('expected an iterable')
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521
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522 if isinstance(key, basestring):
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523 key_func = lambda x: getattr(x, key, x)
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524 elif callable(key):
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525 key_func = key
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526 else:
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527 raise TypeError('expected key to be callable or a string')
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528
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529 if value_transform is None:
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530 value_transform = lambda x: x
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531 if not callable(value_transform):
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532 raise TypeError('expected callable value transform function')
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533
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534 ret = {}
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535 for val in src:
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536 key_of_val = key_func(val)
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537 if key_filter is None or key_filter(key_of_val):
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538 ret.setdefault(key_of_val, []).append(value_transform(val))
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539 return ret
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540
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541
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542 def partition(src, key=bool):
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543 """No relation to :meth:`str.partition`, ``partition`` is like
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544 :func:`bucketize`, but for added convenience returns a tuple of
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545 ``(truthy_values, falsy_values)``.
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546
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547 >>> nonempty, empty = partition(['', '', 'hi', '', 'bye'])
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548 >>> nonempty
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549 ['hi', 'bye']
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550
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551 *key* defaults to :class:`bool`, but can be carefully overridden to
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552 use either a function that returns either ``True`` or ``False`` or
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553 a string name of the attribute on which to partition objects.
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554
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555 >>> import string
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556 >>> is_digit = lambda x: x in string.digits
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557 >>> decimal_digits, hexletters = partition(string.hexdigits, is_digit)
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558 >>> ''.join(decimal_digits), ''.join(hexletters)
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559 ('0123456789', 'abcdefABCDEF')
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560 """
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561 bucketized = bucketize(src, key)
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562 return bucketized.get(True, []), bucketized.get(False, [])
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563
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564
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565 def unique(src, key=None):
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diff changeset
566 """``unique()`` returns a list of unique values, as determined by
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567 *key*, in the order they first appeared in the input iterable,
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568 *src*.
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569
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570 >>> ones_n_zeros = '11010110001010010101010'
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571 >>> ''.join(unique(ones_n_zeros))
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572 '10'
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573
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574 See :func:`unique_iter` docs for more details.
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575 """
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576 return list(unique_iter(src, key))
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577
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578
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579 def unique_iter(src, key=None):
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580 """Yield unique elements from the iterable, *src*, based on *key*,
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581 in the order in which they first appeared in *src*.
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582
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583 >>> repetitious = [1, 2, 3] * 10
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584 >>> list(unique_iter(repetitious))
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585 [1, 2, 3]
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586
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587 By default, *key* is the object itself, but *key* can either be a
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588 callable or, for convenience, a string name of the attribute on
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diff changeset
589 which to uniqueify objects, falling back on identity when the
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590 attribute is not present.
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591
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diff changeset
592 >>> pleasantries = ['hi', 'hello', 'ok', 'bye', 'yes']
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diff changeset
593 >>> list(unique_iter(pleasantries, key=lambda x: len(x)))
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594 ['hi', 'hello', 'bye']
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parents:
diff changeset
595 """
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596 if not is_iterable(src):
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diff changeset
597 raise TypeError('expected an iterable, not %r' % type(src))
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598 if key is None:
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diff changeset
599 key_func = lambda x: x
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diff changeset
600 elif callable(key):
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diff changeset
601 key_func = key
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602 elif isinstance(key, basestring):
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diff changeset
603 key_func = lambda x: getattr(x, key, x)
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diff changeset
604 else:
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parents:
diff changeset
605 raise TypeError('"key" expected a string or callable, not %r' % key)
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diff changeset
606 seen = set()
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607 for i in src:
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608 k = key_func(i)
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diff changeset
609 if k not in seen:
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diff changeset
610 seen.add(k)
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611 yield i
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diff changeset
612 return
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diff changeset
613
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diff changeset
614
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615 def redundant(src, key=None, groups=False):
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616 """The complement of :func:`unique()`.
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diff changeset
617
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618 By default returns non-unique values as a list of the *first*
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619 redundant value in *src*. Pass ``groups=True`` to get groups of
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620 all values with redundancies, ordered by position of the first
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diff changeset
621 redundant value. This is useful in conjunction with some
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parents:
diff changeset
622 normalizing *key* function.
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diff changeset
623
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diff changeset
624 >>> redundant([1, 2, 3, 4])
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diff changeset
625 []
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diff changeset
626 >>> redundant([1, 2, 3, 2, 3, 3, 4])
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627 [2, 3]
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diff changeset
628 >>> redundant([1, 2, 3, 2, 3, 3, 4], groups=True)
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diff changeset
629 [[2, 2], [3, 3, 3]]
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630
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diff changeset
631 An example using a *key* function to do case-insensitive
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diff changeset
632 redundancy detection.
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633
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634 >>> redundant(['hi', 'Hi', 'HI', 'hello'], key=str.lower)
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diff changeset
635 ['Hi']
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diff changeset
636 >>> redundant(['hi', 'Hi', 'HI', 'hello'], groups=True, key=str.lower)
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diff changeset
637 [['hi', 'Hi', 'HI']]
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diff changeset
638
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diff changeset
639 *key* should also be used when the values in *src* are not hashable.
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diff changeset
640
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641 .. note::
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shellac
parents:
diff changeset
642
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
643 This output of this function is designed for reporting
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
644 duplicates in contexts when a unique input is desired. Due to
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
645 the grouped return type, there is no streaming equivalent of
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
646 this function for the time being.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
647
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
648 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
649 if key is None:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
650 pass
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
651 elif callable(key):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
652 key_func = key
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
653 elif isinstance(key, basestring):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
654 key_func = lambda x: getattr(x, key, x)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
655 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
656 raise TypeError('"key" expected a string or callable, not %r' % key)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
657 seen = {} # key to first seen item
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
658 redundant_order = []
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
659 redundant_groups = {}
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
660 for i in src:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
661 k = key_func(i) if key else i
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
662 if k not in seen:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
663 seen[k] = i
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
664 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
665 if k in redundant_groups:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
666 if groups:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
667 redundant_groups[k].append(i)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
668 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
669 redundant_order.append(k)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
670 redundant_groups[k] = [seen[k], i]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
671 if not groups:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
672 ret = [redundant_groups[k][1] for k in redundant_order]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
673 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
674 ret = [redundant_groups[k] for k in redundant_order]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
675 return ret
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
676
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
677
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
678 def one(src, default=None, key=None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
679 """Along the same lines as builtins, :func:`all` and :func:`any`, and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
680 similar to :func:`first`, ``one()`` returns the single object in
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
681 the given iterable *src* that evaluates to ``True``, as determined
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
682 by callable *key*. If unset, *key* defaults to :class:`bool`. If
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
683 no such objects are found, *default* is returned. If *default* is
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
684 not passed, ``None`` is returned.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
685
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
686 If *src* has more than one object that evaluates to ``True``, or
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
687 if there is no object that fulfills such condition, return
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
688 *default*. It's like an `XOR`_ over an iterable.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
689
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
690 >>> one((True, False, False))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
691 True
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
692 >>> one((True, False, True))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
693 >>> one((0, 0, 'a'))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
694 'a'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
695 >>> one((0, False, None))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
696 >>> one((True, True), default=False)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
697 False
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
698 >>> bool(one(('', 1)))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
699 True
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
700 >>> one((10, 20, 30, 42), key=lambda i: i > 40)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
701 42
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
702
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
703 See `Martín Gaitán's original repo`_ for further use cases.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
704
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
705 .. _Martín Gaitán's original repo: https://github.com/mgaitan/one
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
706 .. _XOR: https://en.wikipedia.org/wiki/Exclusive_or
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
707
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
708 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
709 ones = list(itertools.islice(filter(key, src), 2))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
710 return ones[0] if len(ones) == 1 else default
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
711
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
712
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
713 def first(iterable, default=None, key=None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
714 """Return first element of *iterable* that evaluates to ``True``, else
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
715 return ``None`` or optional *default*. Similar to :func:`one`.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
716
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
717 >>> first([0, False, None, [], (), 42])
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
718 42
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
719 >>> first([0, False, None, [], ()]) is None
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
720 True
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
721 >>> first([0, False, None, [], ()], default='ohai')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
722 'ohai'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
723 >>> import re
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
724 >>> m = first(re.match(regex, 'abc') for regex in ['b.*', 'a(.*)'])
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
725 >>> m.group(1)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
726 'bc'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
727
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
728 The optional *key* argument specifies a one-argument predicate function
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
729 like that used for *filter()*. The *key* argument, if supplied, should be
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
730 in keyword form. For example, finding the first even number in an iterable:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
731
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
732 >>> first([1, 1, 3, 4, 5], key=lambda x: x % 2 == 0)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
733 4
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
734
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
735 Contributed by Hynek Schlawack, author of `the original standalone module`_.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
736
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
737 .. _the original standalone module: https://github.com/hynek/first
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
738 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
739 return next(filter(key, iterable), default)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
740
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
741
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
742 def flatten_iter(iterable):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
743 """``flatten_iter()`` yields all the elements from *iterable* while
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
744 collapsing any nested iterables.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
745
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
746 >>> nested = [[1, 2], [[3], [4, 5]]]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
747 >>> list(flatten_iter(nested))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
748 [1, 2, 3, 4, 5]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
749 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
750 for item in iterable:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
751 if isinstance(item, Iterable) and not isinstance(item, basestring):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
752 for subitem in flatten_iter(item):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
753 yield subitem
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
754 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
755 yield item
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
756
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
757 def flatten(iterable):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
758 """``flatten()`` returns a collapsed list of all the elements from
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
759 *iterable* while collapsing any nested iterables.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
760
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
761 >>> nested = [[1, 2], [[3], [4, 5]]]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
762 >>> flatten(nested)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
763 [1, 2, 3, 4, 5]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
764 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
765 return list(flatten_iter(iterable))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
766
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
767
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
768 def same(iterable, ref=_UNSET):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
769 """``same()`` returns ``True`` when all values in *iterable* are
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
770 equal to one another, or optionally a reference value,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
771 *ref*. Similar to :func:`all` and :func:`any` in that it evaluates
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
772 an iterable and returns a :class:`bool`. ``same()`` returns
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
773 ``True`` for empty iterables.
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parents:
diff changeset
774
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shellac
parents:
diff changeset
775 >>> same([])
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parents:
diff changeset
776 True
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
777 >>> same([1])
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
778 True
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
779 >>> same(['a', 'a', 'a'])
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
780 True
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
781 >>> same(range(20))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
782 False
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
783 >>> same([[], []])
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
784 True
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
785 >>> same([[], []], ref='test')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
786 False
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shellac
parents:
diff changeset
787
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
788 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
789 iterator = iter(iterable)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
790 if ref is _UNSET:
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shellac
parents:
diff changeset
791 ref = next(iterator, ref)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
792 return all(val == ref for val in iterator)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
793
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
794
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
795 def default_visit(path, key, value):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
796 # print('visit(%r, %r, %r)' % (path, key, value))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
797 return key, value
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
798
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
799 # enable the extreme: monkeypatching iterutils with a different default_visit
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
800 _orig_default_visit = default_visit
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
801
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
802
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
803 def default_enter(path, key, value):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
804 # print('enter(%r, %r)' % (key, value))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
805 if isinstance(value, basestring):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
806 return value, False
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
807 elif isinstance(value, Mapping):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
808 return value.__class__(), ItemsView(value)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
809 elif isinstance(value, Sequence):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
810 return value.__class__(), enumerate(value)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
811 elif isinstance(value, Set):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
812 return value.__class__(), enumerate(value)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
813 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
814 # files, strings, other iterables, and scalars are not
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
815 # traversed
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
816 return value, False
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
817
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
818
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
819 def default_exit(path, key, old_parent, new_parent, new_items):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
820 # print('exit(%r, %r, %r, %r, %r)'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
821 # % (path, key, old_parent, new_parent, new_items))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
822 ret = new_parent
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
823 if isinstance(new_parent, Mapping):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
824 new_parent.update(new_items)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
825 elif isinstance(new_parent, Sequence):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
826 vals = [v for i, v in new_items]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
827 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
828 new_parent.extend(vals)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
829 except AttributeError:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
830 ret = new_parent.__class__(vals) # tuples
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
831 elif isinstance(new_parent, Set):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
832 vals = [v for i, v in new_items]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
833 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
834 new_parent.update(vals)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
835 except AttributeError:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
836 ret = new_parent.__class__(vals) # frozensets
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
837 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
838 raise RuntimeError('unexpected iterable type: %r' % type(new_parent))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
839 return ret
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
840
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
841
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
842 def remap(root, visit=default_visit, enter=default_enter, exit=default_exit,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
843 **kwargs):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
844 """The remap ("recursive map") function is used to traverse and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
845 transform nested structures. Lists, tuples, sets, and dictionaries
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
846 are just a few of the data structures nested into heterogenous
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
847 tree-like structures that are so common in programming.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
848 Unfortunately, Python's built-in ways to manipulate collections
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
849 are almost all flat. List comprehensions may be fast and succinct,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
850 but they do not recurse, making it tedious to apply quick changes
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
851 or complex transforms to real-world data.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
852
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
853 remap goes where list comprehensions cannot.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
854
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
855 Here's an example of removing all Nones from some data:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
856
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
857 >>> from pprint import pprint
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
858 >>> reviews = {'Star Trek': {'TNG': 10, 'DS9': 8.5, 'ENT': None},
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
859 ... 'Babylon 5': 6, 'Dr. Who': None}
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
860 >>> pprint(remap(reviews, lambda p, k, v: v is not None))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
861 {'Babylon 5': 6, 'Star Trek': {'DS9': 8.5, 'TNG': 10}}
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
862
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
863 Notice how both Nones have been removed despite the nesting in the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
864 dictionary. Not bad for a one-liner, and that's just the beginning.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
865 See `this remap cookbook`_ for more delicious recipes.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
866
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
867 .. _this remap cookbook: http://sedimental.org/remap.html
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
868
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
869 remap takes four main arguments: the object to traverse and three
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
870 optional callables which determine how the remapped object will be
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
871 created.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
872
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
873 Args:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
874
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
875 root: The target object to traverse. By default, remap
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
876 supports iterables like :class:`list`, :class:`tuple`,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
877 :class:`dict`, and :class:`set`, but any object traversable by
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
878 *enter* will work.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
879 visit (callable): This function is called on every item in
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
880 *root*. It must accept three positional arguments, *path*,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
881 *key*, and *value*. *path* is simply a tuple of parents'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
882 keys. *visit* should return the new key-value pair. It may
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
883 also return ``True`` as shorthand to keep the old item
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
884 unmodified, or ``False`` to drop the item from the new
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
885 structure. *visit* is called after *enter*, on the new parent.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
886
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
887 The *visit* function is called for every item in root,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
888 including duplicate items. For traversable values, it is
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
889 called on the new parent object, after all its children
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
890 have been visited. The default visit behavior simply
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
891 returns the key-value pair unmodified.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
892 enter (callable): This function controls which items in *root*
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
893 are traversed. It accepts the same arguments as *visit*: the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
894 path, the key, and the value of the current item. It returns a
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
895 pair of the blank new parent, and an iterator over the items
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
896 which should be visited. If ``False`` is returned instead of
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
897 an iterator, the value will not be traversed.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
898
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
899 The *enter* function is only called once per unique value. The
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
900 default enter behavior support mappings, sequences, and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
901 sets. Strings and all other iterables will not be traversed.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
902 exit (callable): This function determines how to handle items
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
903 once they have been visited. It gets the same three
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
904 arguments as the other functions -- *path*, *key*, *value*
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
905 -- plus two more: the blank new parent object returned
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
906 from *enter*, and a list of the new items, as remapped by
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
907 *visit*.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
908
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
909 Like *enter*, the *exit* function is only called once per
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
910 unique value. The default exit behavior is to simply add
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
911 all new items to the new parent, e.g., using
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
912 :meth:`list.extend` and :meth:`dict.update` to add to the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
913 new parent. Immutable objects, such as a :class:`tuple` or
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
914 :class:`namedtuple`, must be recreated from scratch, but
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
915 use the same type as the new parent passed back from the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
916 *enter* function.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
917 reraise_visit (bool): A pragmatic convenience for the *visit*
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
918 callable. When set to ``False``, remap ignores any errors
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
919 raised by the *visit* callback. Items causing exceptions
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
920 are kept. See examples for more details.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
921
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
922 remap is designed to cover the majority of cases with just the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
923 *visit* callable. While passing in multiple callables is very
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
924 empowering, remap is designed so very few cases should require
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
925 passing more than one function.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
926
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
927 When passing *enter* and *exit*, it's common and easiest to build
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
928 on the default behavior. Simply add ``from boltons.iterutils import
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
929 default_enter`` (or ``default_exit``), and have your enter/exit
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
930 function call the default behavior before or after your custom
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
931 logic. See `this example`_.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
932
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
933 Duplicate and self-referential objects (aka reference loops) are
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
934 automatically handled internally, `as shown here`_.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
935
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
936 .. _this example: http://sedimental.org/remap.html#sort_all_lists
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
937 .. _as shown here: http://sedimental.org/remap.html#corner_cases
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
938
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
939 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
940 # TODO: improve argument formatting in sphinx doc
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
941 # TODO: enter() return (False, items) to continue traverse but cancel copy?
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
942 if not callable(visit):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
943 raise TypeError('visit expected callable, not: %r' % visit)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
944 if not callable(enter):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
945 raise TypeError('enter expected callable, not: %r' % enter)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
946 if not callable(exit):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
947 raise TypeError('exit expected callable, not: %r' % exit)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
948 reraise_visit = kwargs.pop('reraise_visit', True)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
949 if kwargs:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
950 raise TypeError('unexpected keyword arguments: %r' % kwargs.keys())
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
951
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
952 path, registry, stack = (), {}, [(None, root)]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
953 new_items_stack = []
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
954 while stack:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
955 key, value = stack.pop()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
956 id_value = id(value)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
957 if key is _REMAP_EXIT:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
958 key, new_parent, old_parent = value
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
959 id_value = id(old_parent)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
960 path, new_items = new_items_stack.pop()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
961 value = exit(path, key, old_parent, new_parent, new_items)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
962 registry[id_value] = value
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
963 if not new_items_stack:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
964 continue
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
965 elif id_value in registry:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
966 value = registry[id_value]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
967 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
968 res = enter(path, key, value)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
969 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
970 new_parent, new_items = res
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
971 except TypeError:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
972 # TODO: handle False?
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
973 raise TypeError('enter should return a tuple of (new_parent,'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
974 ' items_iterator), not: %r' % res)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
975 if new_items is not False:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
976 # traverse unless False is explicitly passed
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
977 registry[id_value] = new_parent
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
978 new_items_stack.append((path, []))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
979 if value is not root:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
980 path += (key,)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
981 stack.append((_REMAP_EXIT, (key, new_parent, value)))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
982 if new_items:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
983 stack.extend(reversed(list(new_items)))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
984 continue
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
985 if visit is _orig_default_visit:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
986 # avoid function call overhead by inlining identity operation
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
987 visited_item = (key, value)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
988 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
989 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
990 visited_item = visit(path, key, value)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
991 except Exception:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
992 if reraise_visit:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
993 raise
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
994 visited_item = True
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
995 if visited_item is False:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
996 continue # drop
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
997 elif visited_item is True:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
998 visited_item = (key, value)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
999 # TODO: typecheck?
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1000 # raise TypeError('expected (key, value) from visit(),'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1001 # ' not: %r' % visited_item)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1002 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1003 new_items_stack[-1][1].append(visited_item)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1004 except IndexError:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1005 raise TypeError('expected remappable root, not: %r' % root)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1006 return value
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1007
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1008
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1009 class PathAccessError(KeyError, IndexError, TypeError):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1010 """An amalgamation of KeyError, IndexError, and TypeError,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1011 representing what can occur when looking up a path in a nested
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1012 object.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1013 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1014 def __init__(self, exc, seg, path):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1015 self.exc = exc
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1016 self.seg = seg
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1017 self.path = path
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1018
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1019 def __repr__(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1020 cn = self.__class__.__name__
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1021 return '%s(%r, %r, %r)' % (cn, self.exc, self.seg, self.path)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1022
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1023 def __str__(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1024 return ('could not access %r from path %r, got error: %r'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1025 % (self.seg, self.path, self.exc))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1026
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1027
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1028 def get_path(root, path, default=_UNSET):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1029 """Retrieve a value from a nested object via a tuple representing the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1030 lookup path.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1031
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1032 >>> root = {'a': {'b': {'c': [[1], [2], [3]]}}}
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1033 >>> get_path(root, ('a', 'b', 'c', 2, 0))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1034 3
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1035
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1036 The path format is intentionally consistent with that of
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1037 :func:`remap`.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1038
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1039 One of get_path's chief aims is improved error messaging. EAFP is
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1040 great, but the error messages are not.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1041
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1042 For instance, ``root['a']['b']['c'][2][1]`` gives back
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1043 ``IndexError: list index out of range``
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1044
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1045 What went out of range where? get_path currently raises
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1046 ``PathAccessError: could not access 2 from path ('a', 'b', 'c', 2,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1047 1), got error: IndexError('list index out of range',)``, a
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1048 subclass of IndexError and KeyError.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1049
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1050 You can also pass a default that covers the entire operation,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1051 should the lookup fail at any level.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1052
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1053 Args:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1054 root: The target nesting of dictionaries, lists, or other
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1055 objects supporting ``__getitem__``.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1056 path (tuple): A list of strings and integers to be successively
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1057 looked up within *root*.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1058 default: The value to be returned should any
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1059 ``PathAccessError`` exceptions be raised.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1060 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1061 if isinstance(path, basestring):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1062 path = path.split('.')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1063 cur = root
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1064 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1065 for seg in path:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1066 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1067 cur = cur[seg]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1068 except (KeyError, IndexError) as exc:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1069 raise PathAccessError(exc, seg, path)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1070 except TypeError as exc:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1071 # either string index in a list, or a parent that
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1072 # doesn't support indexing
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1073 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1074 seg = int(seg)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1075 cur = cur[seg]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1076 except (ValueError, KeyError, IndexError, TypeError):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1077 if not is_iterable(cur):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1078 exc = TypeError('%r object is not indexable'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1079 % type(cur).__name__)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1080 raise PathAccessError(exc, seg, path)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1081 except PathAccessError:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1082 if default is _UNSET:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1083 raise
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1084 return default
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1085 return cur
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1086
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1087
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1088 def research(root, query=lambda p, k, v: True, reraise=False):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1089 """The :func:`research` function uses :func:`remap` to recurse over
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1090 any data nested in *root*, and find values which match a given
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1091 criterion, specified by the *query* callable.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1092
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1093 Results are returned as a list of ``(path, value)`` pairs. The
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1094 paths are tuples in the same format accepted by
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1095 :func:`get_path`. This can be useful for comparing values nested
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1096 in two or more different structures.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1097
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1098 Here's a simple example that finds all integers:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1099
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1100 >>> root = {'a': {'b': 1, 'c': (2, 'd', 3)}, 'e': None}
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1101 >>> res = research(root, query=lambda p, k, v: isinstance(v, int))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1102 >>> print(sorted(res))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1103 [(('a', 'b'), 1), (('a', 'c', 0), 2), (('a', 'c', 2), 3)]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1104
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1105 Note how *query* follows the same, familiar ``path, key, value``
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1106 signature as the ``visit`` and ``enter`` functions on
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1107 :func:`remap`, and returns a :class:`bool`.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1108
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1109 Args:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1110 root: The target object to search. Supports the same types of
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1111 objects as :func:`remap`, including :class:`list`,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1112 :class:`tuple`, :class:`dict`, and :class:`set`.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1113 query (callable): The function called on every object to
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1114 determine whether to include it in the search results. The
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1115 callable must accept three arguments, *path*, *key*, and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1116 *value*, commonly abbreviated *p*, *k*, and *v*, same as
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1117 *enter* and *visit* from :func:`remap`.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1118 reraise (bool): Whether to reraise exceptions raised by *query*
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1119 or to simply drop the result that caused the error.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1120
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1121
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1122 With :func:`research` it's easy to inspect the details of a data
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1123 structure, like finding values that are at a certain depth (using
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1124 ``len(p)``) and much more. If more advanced functionality is
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1125 needed, check out the code and make your own :func:`remap`
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1126 wrapper, and consider `submitting a patch`_!
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1127
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1128 .. _submitting a patch: https://github.com/mahmoud/boltons/pulls
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1129 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1130 ret = []
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1131
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1132 if not callable(query):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1133 raise TypeError('query expected callable, not: %r' % query)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1134
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1135 def enter(path, key, value):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1136 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1137 if query(path, key, value):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1138 ret.append((path + (key,), value))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1139 except Exception:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1140 if reraise:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1141 raise
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1142 return default_enter(path, key, value)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1143
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1144 remap(root, enter=enter)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1145 return ret
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1146
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1147
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1148 # TODO: recollect()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1149 # TODO: refilter()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1150 # TODO: reiter()
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diff changeset
1151
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
1152
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1153 # GUID iterators: 10x faster and somewhat more compact than uuid.
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parents:
diff changeset
1154
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1155 class GUIDerator(object):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1156 """The GUIDerator is an iterator that yields a globally-unique
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1157 identifier (GUID) on every iteration. The GUIDs produced are
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1158 hexadecimal strings.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1159
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parents:
diff changeset
1160 Testing shows it to be around 12x faster than the uuid module. By
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1161 default it is also more compact, partly due to its default 96-bit
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1162 (24-hexdigit) length. 96 bits of randomness means that there is a
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1163 1 in 2 ^ 32 chance of collision after 2 ^ 64 iterations. If more
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1164 or less uniqueness is desired, the *size* argument can be adjusted
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1165 accordingly.
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diff changeset
1166
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parents:
diff changeset
1167 Args:
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parents:
diff changeset
1168 size (int): character length of the GUID, defaults to 24. Lengths
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parents:
diff changeset
1169 between 20 and 36 are considered valid.
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parents:
diff changeset
1170
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diff changeset
1171 The GUIDerator has built-in fork protection that causes it to
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1172 detect a fork on next iteration and reseed accordingly.
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parents:
diff changeset
1173
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1174 """
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parents:
diff changeset
1175 def __init__(self, size=24):
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parents:
diff changeset
1176 self.size = size
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diff changeset
1177 if size < 20 or size > 36:
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parents:
diff changeset
1178 raise ValueError('expected 20 < size <= 36')
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parents:
diff changeset
1179 self.count = itertools.count()
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parents:
diff changeset
1180 self.reseed()
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parents:
diff changeset
1181
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parents:
diff changeset
1182 def reseed(self):
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parents:
diff changeset
1183 self.pid = os.getpid()
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parents:
diff changeset
1184 self.salt = '-'.join([str(self.pid),
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parents:
diff changeset
1185 socket.gethostname() or b'<nohostname>',
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parents:
diff changeset
1186 str(time.time()),
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parents:
diff changeset
1187 codecs.encode(os.urandom(6),
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1188 'hex_codec').decode('ascii')])
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1189 # that codecs trick is the best/only way to get a bytes to
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parents:
diff changeset
1190 # hexbytes in py2/3
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parents:
diff changeset
1191 return
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diff changeset
1192
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diff changeset
1193 def __iter__(self):
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parents:
diff changeset
1194 return self
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diff changeset
1195
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diff changeset
1196 if _IS_PY3:
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parents:
diff changeset
1197 def __next__(self):
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diff changeset
1198 if os.getpid() != self.pid:
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parents:
diff changeset
1199 self.reseed()
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diff changeset
1200 target_bytes = (self.salt + str(next(self.count))).encode('utf8')
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parents:
diff changeset
1201 hash_text = hashlib.sha1(target_bytes).hexdigest()[:self.size]
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parents:
diff changeset
1202 return hash_text
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diff changeset
1203 else:
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parents:
diff changeset
1204 def __next__(self):
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parents:
diff changeset
1205 if os.getpid() != self.pid:
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parents:
diff changeset
1206 self.reseed()
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diff changeset
1207 return hashlib.sha1(self.salt +
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1208 str(next(self.count))).hexdigest()[:self.size]
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parents:
diff changeset
1209
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diff changeset
1210 next = __next__
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parents:
diff changeset
1211
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diff changeset
1212
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diff changeset
1213 class SequentialGUIDerator(GUIDerator):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1214 """Much like the standard GUIDerator, the SequentialGUIDerator is an
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1215 iterator that yields a globally-unique identifier (GUID) on every
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parents:
diff changeset
1216 iteration. The GUIDs produced are hexadecimal strings.
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diff changeset
1217
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parents:
diff changeset
1218 The SequentialGUIDerator differs in that it picks a starting GUID
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parents:
diff changeset
1219 value and increments every iteration. This yields GUIDs which are
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1220 of course unique, but also ordered and lexicographically sortable.
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parents:
diff changeset
1221
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diff changeset
1222 The SequentialGUIDerator is around 50% faster than the normal
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parents:
diff changeset
1223 GUIDerator, making it almost 20x as fast as the built-in uuid
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parents:
diff changeset
1224 module. By default it is also more compact, partly due to its
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1225 96-bit (24-hexdigit) default length. 96 bits of randomness means that
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1226 there is a 1 in 2 ^ 32 chance of collision after 2 ^ 64
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1227 iterations. If more or less uniqueness is desired, the *size*
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parents:
diff changeset
1228 argument can be adjusted accordingly.
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parents:
diff changeset
1229
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parents:
diff changeset
1230 Args:
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parents:
diff changeset
1231 size (int): character length of the GUID, defaults to 24.
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parents:
diff changeset
1232
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parents:
diff changeset
1233 Note that with SequentialGUIDerator there is a chance of GUIDs
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1234 growing larger than the size configured. The SequentialGUIDerator
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1235 has built-in fork protection that causes it to detect a fork on
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1236 next iteration and reseed accordingly.
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parents:
diff changeset
1237
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parents:
diff changeset
1238 """
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parents:
diff changeset
1239
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1240 if _IS_PY3:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1241 def reseed(self):
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parents:
diff changeset
1242 super(SequentialGUIDerator, self).reseed()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1243 start_str = hashlib.sha1(self.salt.encode('utf8')).hexdigest()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1244 self.start = int(start_str[:self.size], 16)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1245 self.start |= (1 << ((self.size * 4) - 2))
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parents:
diff changeset
1246 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1247 def reseed(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1248 super(SequentialGUIDerator, self).reseed()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1249 start_str = hashlib.sha1(self.salt).hexdigest()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1250 self.start = int(start_str[:self.size], 16)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1251 self.start |= (1 << ((self.size * 4) - 2))
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parents:
diff changeset
1252
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1253 def __next__(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1254 if os.getpid() != self.pid:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1255 self.reseed()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1256 return '%x' % (next(self.count) + self.start)
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shellac
parents:
diff changeset
1257
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1258 next = __next__
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parents:
diff changeset
1259
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shellac
parents:
diff changeset
1260
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1261 guid_iter = GUIDerator()
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shellac
parents:
diff changeset
1262 seq_guid_iter = SequentialGUIDerator()
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shellac
parents:
diff changeset
1263
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parents:
diff changeset
1264
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1265 def soft_sorted(iterable, first=None, last=None, key=None, reverse=False):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1266 """For when you care about the order of some elements, but not about
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1267 others.
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shellac
parents:
diff changeset
1268
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parents:
diff changeset
1269 Use this to float to the top and/or sink to the bottom a specific
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1270 ordering, while sorting the rest of the elements according to
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
1271 normal :func:`sorted` rules.
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shellac
parents:
diff changeset
1272
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shellac
parents:
diff changeset
1273 >>> soft_sorted(['two', 'b', 'one', 'a'], first=['one', 'two'])
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
1274 ['one', 'two', 'a', 'b']
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shellac
parents:
diff changeset
1275 >>> soft_sorted(range(7), first=[6, 15], last=[2, 4], reverse=True)
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1276 [6, 5, 3, 1, 0, 2, 4]
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1277 >>> import string
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1278 >>> ''.join(soft_sorted(string.hexdigits, first='za1', last='b', key=str.lower))
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1279 'aA1023456789cCdDeEfFbB'
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1280
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1281 Args:
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1282 iterable (list): A list or other iterable to sort.
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1283 first (list): A sequence to enforce for elements which should
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1284 appear at the beginning of the returned list.
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1285 last (list): A sequence to enforce for elements which should
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1286 appear at the end of the returned list.
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1287 key (callable): Callable used to generate a comparable key for
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1288 each item to be sorted, same as the key in
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1289 :func:`sorted`. Note that entries in *first* and *last*
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1290 should be the keys for the items. Defaults to
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1291 passthrough/the identity function.
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1292 reverse (bool): Whether or not elements not explicitly ordered
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1293 by *first* and *last* should be in reverse order or not.
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1294
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1295 Returns a new list in sorted order.
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1296 """
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1297 first = first or []
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1298 last = last or []
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1299 key = key or (lambda x: x)
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1300 seq = list(iterable)
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1301 other = [x for x in seq if not ((first and key(x) in first) or (last and key(x) in last))]
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1302 other.sort(key=key, reverse=reverse)
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1303
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1304 if first:
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1305 first = sorted([x for x in seq if key(x) in first], key=lambda x: first.index(key(x)))
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1306 if last:
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1307 last = sorted([x for x in seq if key(x) in last], key=lambda x: last.index(key(x)))
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1308 return first + other + last
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1309
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1310 """
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1311 May actually be faster to do an isinstance check for a str path
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1312
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1313 $ python -m timeit -s "x = [1]" "x[0]"
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1314 10000000 loops, best of 3: 0.0207 usec per loop
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1315 $ python -m timeit -s "x = [1]" "try: x[0] \nexcept: pass"
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1316 10000000 loops, best of 3: 0.029 usec per loop
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1317 $ python -m timeit -s "x = [1]" "try: x[1] \nexcept: pass"
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1318 1000000 loops, best of 3: 0.315 usec per loop
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1319 # setting up try/except is fast, only around 0.01us
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1320 # actually triggering the exception takes almost 10x as long
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1321
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1322 $ python -m timeit -s "x = [1]" "isinstance(x, basestring)"
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1323 10000000 loops, best of 3: 0.141 usec per loop
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1324 $ python -m timeit -s "x = [1]" "isinstance(x, str)"
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1325 10000000 loops, best of 3: 0.131 usec per loop
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1326 $ python -m timeit -s "x = [1]" "try: x.split('.')\n except: pass"
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1327 1000000 loops, best of 3: 0.443 usec per loop
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1328 $ python -m timeit -s "x = [1]" "try: x.split('.') \nexcept AttributeError: pass"
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1329 1000000 loops, best of 3: 0.544 usec per loop
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1330 """