Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/past/builtins/noniterators.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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1 """
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2 This module is designed to be used as follows::
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3
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4 from past.builtins.noniterators import filter, map, range, reduce, zip
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5
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6 And then, for example::
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7
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8 assert isinstance(range(5), list)
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9
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10 The list-producing functions this brings in are::
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11
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12 - ``filter``
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13 - ``map``
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14 - ``range``
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15 - ``reduce``
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16 - ``zip``
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17
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18 """
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19
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20 from __future__ import division, absolute_import, print_function
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21
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22 from itertools import chain, starmap
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23 import itertools # since zip_longest doesn't exist on Py2
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24 from past.types import basestring
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25 from past.utils import PY3
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26
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27
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28 def flatmap(f, items):
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29 return chain.from_iterable(map(f, items))
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30
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31
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32 if PY3:
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33 import builtins
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34
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35 # list-producing versions of the major Python iterating functions
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36 def oldfilter(*args):
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37 """
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38 filter(function or None, sequence) -> list, tuple, or string
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39
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40 Return those items of sequence for which function(item) is true.
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41 If function is None, return the items that are true. If sequence
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42 is a tuple or string, return the same type, else return a list.
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43 """
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44 mytype = type(args[1])
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45 if isinstance(args[1], basestring):
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46 return mytype().join(builtins.filter(*args))
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47 elif isinstance(args[1], (tuple, list)):
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48 return mytype(builtins.filter(*args))
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49 else:
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50 # Fall back to list. Is this the right thing to do?
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51 return list(builtins.filter(*args))
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52
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53 # This is surprisingly difficult to get right. For example, the
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54 # solutions here fail with the test cases in the docstring below:
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55 # http://stackoverflow.com/questions/8072755/
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56 def oldmap(func, *iterables):
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57 """
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58 map(function, sequence[, sequence, ...]) -> list
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59
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60 Return a list of the results of applying the function to the
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61 items of the argument sequence(s). If more than one sequence is
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62 given, the function is called with an argument list consisting of
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63 the corresponding item of each sequence, substituting None for
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64 missing values when not all sequences have the same length. If
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65 the function is None, return a list of the items of the sequence
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66 (or a list of tuples if more than one sequence).
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67
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68 Test cases:
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69 >>> oldmap(None, 'hello world')
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70 ['h', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd']
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71
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72 >>> oldmap(None, range(4))
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73 [0, 1, 2, 3]
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74
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75 More test cases are in test_past.test_builtins.
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76 """
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77 zipped = itertools.zip_longest(*iterables)
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78 l = list(zipped)
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79 if len(l) == 0:
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80 return []
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81 if func is None:
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82 result = l
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83 else:
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84 result = list(starmap(func, l))
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85
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86 # Inspect to see whether it's a simple sequence of tuples
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87 try:
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88 if max([len(item) for item in result]) == 1:
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89 return list(chain.from_iterable(result))
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90 # return list(flatmap(func, result))
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91 except TypeError as e:
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92 # Simple objects like ints have no len()
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93 pass
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94 return result
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95
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96 ############################
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97 ### For reference, the source code for Py2.7 map function:
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98 # static PyObject *
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99 # builtin_map(PyObject *self, PyObject *args)
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100 # {
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101 # typedef struct {
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102 # PyObject *it; /* the iterator object */
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103 # int saw_StopIteration; /* bool: did the iterator end? */
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104 # } sequence;
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105 #
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106 # PyObject *func, *result;
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107 # sequence *seqs = NULL, *sqp;
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108 # Py_ssize_t n, len;
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109 # register int i, j;
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110 #
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111 # n = PyTuple_Size(args);
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112 # if (n < 2) {
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113 # PyErr_SetString(PyExc_TypeError,
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114 # "map() requires at least two args");
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115 # return NULL;
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116 # }
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117 #
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118 # func = PyTuple_GetItem(args, 0);
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119 # n--;
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120 #
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121 # if (func == Py_None) {
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122 # if (PyErr_WarnPy3k("map(None, ...) not supported in 3.x; "
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123 # "use list(...)", 1) < 0)
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124 # return NULL;
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125 # if (n == 1) {
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126 # /* map(None, S) is the same as list(S). */
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127 # return PySequence_List(PyTuple_GetItem(args, 1));
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128 # }
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129 # }
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130 #
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131 # /* Get space for sequence descriptors. Must NULL out the iterator
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132 # * pointers so that jumping to Fail_2 later doesn't see trash.
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133 # */
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134 # if ((seqs = PyMem_NEW(sequence, n)) == NULL) {
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135 # PyErr_NoMemory();
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136 # return NULL;
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137 # }
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138 # for (i = 0; i < n; ++i) {
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139 # seqs[i].it = (PyObject*)NULL;
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140 # seqs[i].saw_StopIteration = 0;
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141 # }
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142 #
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143 # /* Do a first pass to obtain iterators for the arguments, and set len
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144 # * to the largest of their lengths.
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145 # */
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146 # len = 0;
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147 # for (i = 0, sqp = seqs; i < n; ++i, ++sqp) {
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148 # PyObject *curseq;
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149 # Py_ssize_t curlen;
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150 #
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151 # /* Get iterator. */
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152 # curseq = PyTuple_GetItem(args, i+1);
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153 # sqp->it = PyObject_GetIter(curseq);
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154 # if (sqp->it == NULL) {
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155 # static char errmsg[] =
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156 # "argument %d to map() must support iteration";
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157 # char errbuf[sizeof(errmsg) + 25];
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158 # PyOS_snprintf(errbuf, sizeof(errbuf), errmsg, i+2);
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159 # PyErr_SetString(PyExc_TypeError, errbuf);
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160 # goto Fail_2;
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161 # }
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162 #
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163 # /* Update len. */
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164 # curlen = _PyObject_LengthHint(curseq, 8);
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165 # if (curlen > len)
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166 # len = curlen;
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167 # }
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168 #
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169 # /* Get space for the result list. */
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170 # if ((result = (PyObject *) PyList_New(len)) == NULL)
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171 # goto Fail_2;
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172 #
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173 # /* Iterate over the sequences until all have stopped. */
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174 # for (i = 0; ; ++i) {
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175 # PyObject *alist, *item=NULL, *value;
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176 # int numactive = 0;
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177 #
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178 # if (func == Py_None && n == 1)
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179 # alist = NULL;
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180 # else if ((alist = PyTuple_New(n)) == NULL)
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181 # goto Fail_1;
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182 #
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183 # for (j = 0, sqp = seqs; j < n; ++j, ++sqp) {
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184 # if (sqp->saw_StopIteration) {
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185 # Py_INCREF(Py_None);
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186 # item = Py_None;
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187 # }
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188 # else {
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189 # item = PyIter_Next(sqp->it);
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190 # if (item)
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191 # ++numactive;
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192 # else {
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193 # if (PyErr_Occurred()) {
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194 # Py_XDECREF(alist);
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195 # goto Fail_1;
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196 # }
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197 # Py_INCREF(Py_None);
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198 # item = Py_None;
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199 # sqp->saw_StopIteration = 1;
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200 # }
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201 # }
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202 # if (alist)
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203 # PyTuple_SET_ITEM(alist, j, item);
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204 # else
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205 # break;
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206 # }
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207 #
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208 # if (!alist)
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209 # alist = item;
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210 #
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211 # if (numactive == 0) {
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212 # Py_DECREF(alist);
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213 # break;
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214 # }
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215 #
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216 # if (func == Py_None)
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217 # value = alist;
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218 # else {
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219 # value = PyEval_CallObject(func, alist);
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220 # Py_DECREF(alist);
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221 # if (value == NULL)
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222 # goto Fail_1;
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223 # }
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224 # if (i >= len) {
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225 # int status = PyList_Append(result, value);
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226 # Py_DECREF(value);
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227 # if (status < 0)
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228 # goto Fail_1;
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229 # }
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230 # else if (PyList_SetItem(result, i, value) < 0)
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231 # goto Fail_1;
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232 # }
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233 #
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234 # if (i < len && PyList_SetSlice(result, i, len, NULL) < 0)
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235 # goto Fail_1;
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236 #
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237 # goto Succeed;
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238 #
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239 # Fail_1:
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240 # Py_DECREF(result);
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241 # Fail_2:
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242 # result = NULL;
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243 # Succeed:
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244 # assert(seqs);
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245 # for (i = 0; i < n; ++i)
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246 # Py_XDECREF(seqs[i].it);
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247 # PyMem_DEL(seqs);
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248 # return result;
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249 # }
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250
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251 def oldrange(*args, **kwargs):
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252 return list(builtins.range(*args, **kwargs))
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253
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254 def oldzip(*args, **kwargs):
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255 return list(builtins.zip(*args, **kwargs))
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256
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257 filter = oldfilter
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258 map = oldmap
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259 range = oldrange
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260 from functools import reduce
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261 zip = oldzip
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262 __all__ = ['filter', 'map', 'range', 'reduce', 'zip']
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263
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264 else:
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265 import __builtin__
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266 # Python 2-builtin ranges produce lists
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267 filter = __builtin__.filter
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268 map = __builtin__.map
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269 range = __builtin__.range
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270 reduce = __builtin__.reduce
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271 zip = __builtin__.zip
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272 __all__ = []