Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/humanfriendly/__init__.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 # Human friendly input/output in Python.
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2 #
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3 # Author: Peter Odding <peter@peterodding.com>
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4 # Last Change: April 19, 2020
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5 # URL: https://humanfriendly.readthedocs.io
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6
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7 """The main module of the `humanfriendly` package."""
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8
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9 # Standard library modules.
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10 import collections
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11 import datetime
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12 import decimal
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13 import numbers
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14 import os
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15 import os.path
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16 import re
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17 import time
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18
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19 # Modules included in our package.
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20 from humanfriendly.compat import is_string, monotonic
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21 from humanfriendly.deprecation import define_aliases
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22 from humanfriendly.text import concatenate, format, pluralize, tokenize
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23
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24 # Public identifiers that require documentation.
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25 __all__ = (
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26 'CombinedUnit',
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27 'InvalidDate',
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28 'InvalidLength',
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29 'InvalidSize',
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30 'InvalidTimespan',
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31 'SizeUnit',
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32 'Timer',
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33 '__version__',
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34 'coerce_boolean',
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35 'coerce_pattern',
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36 'coerce_seconds',
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37 'disk_size_units',
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38 'format_length',
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39 'format_number',
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40 'format_path',
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41 'format_size',
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42 'format_timespan',
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43 'length_size_units',
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44 'parse_date',
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45 'parse_length',
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46 'parse_path',
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47 'parse_size',
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48 'parse_timespan',
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49 'round_number',
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50 'time_units',
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51 )
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52
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53 # Semi-standard module versioning.
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54 __version__ = '8.2'
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55
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56 # Named tuples to define units of size.
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57 SizeUnit = collections.namedtuple('SizeUnit', 'divider, symbol, name')
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58 CombinedUnit = collections.namedtuple('CombinedUnit', 'decimal, binary')
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59
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60 # Common disk size units in binary (base-2) and decimal (base-10) multiples.
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61 disk_size_units = (
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62 CombinedUnit(SizeUnit(1000**1, 'KB', 'kilobyte'), SizeUnit(1024**1, 'KiB', 'kibibyte')),
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63 CombinedUnit(SizeUnit(1000**2, 'MB', 'megabyte'), SizeUnit(1024**2, 'MiB', 'mebibyte')),
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64 CombinedUnit(SizeUnit(1000**3, 'GB', 'gigabyte'), SizeUnit(1024**3, 'GiB', 'gibibyte')),
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65 CombinedUnit(SizeUnit(1000**4, 'TB', 'terabyte'), SizeUnit(1024**4, 'TiB', 'tebibyte')),
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66 CombinedUnit(SizeUnit(1000**5, 'PB', 'petabyte'), SizeUnit(1024**5, 'PiB', 'pebibyte')),
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67 CombinedUnit(SizeUnit(1000**6, 'EB', 'exabyte'), SizeUnit(1024**6, 'EiB', 'exbibyte')),
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68 CombinedUnit(SizeUnit(1000**7, 'ZB', 'zettabyte'), SizeUnit(1024**7, 'ZiB', 'zebibyte')),
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69 CombinedUnit(SizeUnit(1000**8, 'YB', 'yottabyte'), SizeUnit(1024**8, 'YiB', 'yobibyte')),
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70 )
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71
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72 # Common length size units, used for formatting and parsing.
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73 length_size_units = (dict(prefix='nm', divider=1e-09, singular='nm', plural='nm'),
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74 dict(prefix='mm', divider=1e-03, singular='mm', plural='mm'),
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75 dict(prefix='cm', divider=1e-02, singular='cm', plural='cm'),
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76 dict(prefix='m', divider=1, singular='metre', plural='metres'),
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77 dict(prefix='km', divider=1000, singular='km', plural='km'))
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78
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79 # Common time units, used for formatting of time spans.
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80 time_units = (dict(divider=1e-9, singular='nanosecond', plural='nanoseconds', abbreviations=['ns']),
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81 dict(divider=1e-6, singular='microsecond', plural='microseconds', abbreviations=['us']),
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82 dict(divider=1e-3, singular='millisecond', plural='milliseconds', abbreviations=['ms']),
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83 dict(divider=1, singular='second', plural='seconds', abbreviations=['s', 'sec', 'secs']),
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84 dict(divider=60, singular='minute', plural='minutes', abbreviations=['m', 'min', 'mins']),
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85 dict(divider=60 * 60, singular='hour', plural='hours', abbreviations=['h']),
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86 dict(divider=60 * 60 * 24, singular='day', plural='days', abbreviations=['d']),
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87 dict(divider=60 * 60 * 24 * 7, singular='week', plural='weeks', abbreviations=['w']),
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88 dict(divider=60 * 60 * 24 * 7 * 52, singular='year', plural='years', abbreviations=['y']))
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89
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90
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91 def coerce_boolean(value):
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92 """
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93 Coerce any value to a boolean.
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94
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95 :param value: Any Python value. If the value is a string:
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96
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97 - The strings '1', 'yes', 'true' and 'on' are coerced to :data:`True`.
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98 - The strings '0', 'no', 'false' and 'off' are coerced to :data:`False`.
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99 - Other strings raise an exception.
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100
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101 Other Python values are coerced using :class:`bool`.
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102 :returns: A proper boolean value.
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103 :raises: :exc:`exceptions.ValueError` when the value is a string but
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104 cannot be coerced with certainty.
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105 """
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106 if is_string(value):
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107 normalized = value.strip().lower()
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108 if normalized in ('1', 'yes', 'true', 'on'):
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109 return True
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110 elif normalized in ('0', 'no', 'false', 'off', ''):
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111 return False
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112 else:
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113 msg = "Failed to coerce string to boolean! (%r)"
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114 raise ValueError(format(msg, value))
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115 else:
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116 return bool(value)
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117
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118
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119 def coerce_pattern(value, flags=0):
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120 """
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121 Coerce strings to compiled regular expressions.
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122
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123 :param value: A string containing a regular expression pattern
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124 or a compiled regular expression.
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125 :param flags: The flags used to compile the pattern (an integer).
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126 :returns: A compiled regular expression.
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127 :raises: :exc:`~exceptions.ValueError` when `value` isn't a string
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128 and also isn't a compiled regular expression.
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129 """
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130 if is_string(value):
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131 value = re.compile(value, flags)
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132 else:
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133 empty_pattern = re.compile('')
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134 pattern_type = type(empty_pattern)
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135 if not isinstance(value, pattern_type):
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136 msg = "Failed to coerce value to compiled regular expression! (%r)"
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137 raise ValueError(format(msg, value))
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138 return value
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139
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140
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141 def coerce_seconds(value):
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142 """
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143 Coerce a value to the number of seconds.
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144
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145 :param value: An :class:`int`, :class:`float` or
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146 :class:`datetime.timedelta` object.
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147 :returns: An :class:`int` or :class:`float` value.
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148
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149 When `value` is a :class:`datetime.timedelta` object the
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150 :meth:`~datetime.timedelta.total_seconds()` method is called.
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151 """
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152 if isinstance(value, datetime.timedelta):
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153 return value.total_seconds()
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154 if not isinstance(value, numbers.Number):
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155 msg = "Failed to coerce value to number of seconds! (%r)"
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156 raise ValueError(format(msg, value))
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157 return value
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158
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159
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160 def format_size(num_bytes, keep_width=False, binary=False):
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161 """
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162 Format a byte count as a human readable file size.
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163
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164 :param num_bytes: The size to format in bytes (an integer).
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165 :param keep_width: :data:`True` if trailing zeros should not be stripped,
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166 :data:`False` if they can be stripped.
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167 :param binary: :data:`True` to use binary multiples of bytes (base-2),
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168 :data:`False` to use decimal multiples of bytes (base-10).
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169 :returns: The corresponding human readable file size (a string).
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170
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171 This function knows how to format sizes in bytes, kilobytes, megabytes,
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172 gigabytes, terabytes and petabytes. Some examples:
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173
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174 >>> from humanfriendly import format_size
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175 >>> format_size(0)
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176 '0 bytes'
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177 >>> format_size(1)
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178 '1 byte'
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179 >>> format_size(5)
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180 '5 bytes'
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181 > format_size(1000)
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182 '1 KB'
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183 > format_size(1024, binary=True)
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184 '1 KiB'
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185 >>> format_size(1000 ** 3 * 4)
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186 '4 GB'
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187 """
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188 for unit in reversed(disk_size_units):
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189 if num_bytes >= unit.binary.divider and binary:
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190 number = round_number(float(num_bytes) / unit.binary.divider, keep_width=keep_width)
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191 return pluralize(number, unit.binary.symbol, unit.binary.symbol)
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192 elif num_bytes >= unit.decimal.divider and not binary:
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193 number = round_number(float(num_bytes) / unit.decimal.divider, keep_width=keep_width)
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194 return pluralize(number, unit.decimal.symbol, unit.decimal.symbol)
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195 return pluralize(num_bytes, 'byte')
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196
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197
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198 def parse_size(size, binary=False):
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199 """
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200 Parse a human readable data size and return the number of bytes.
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201
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202 :param size: The human readable file size to parse (a string).
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203 :param binary: :data:`True` to use binary multiples of bytes (base-2) for
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204 ambiguous unit symbols and names, :data:`False` to use
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205 decimal multiples of bytes (base-10).
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206 :returns: The corresponding size in bytes (an integer).
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207 :raises: :exc:`InvalidSize` when the input can't be parsed.
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208
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209 This function knows how to parse sizes in bytes, kilobytes, megabytes,
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210 gigabytes, terabytes and petabytes. Some examples:
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211
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212 >>> from humanfriendly import parse_size
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213 >>> parse_size('42')
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214 42
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215 >>> parse_size('13b')
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216 13
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217 >>> parse_size('5 bytes')
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218 5
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219 >>> parse_size('1 KB')
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220 1000
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221 >>> parse_size('1 kilobyte')
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222 1000
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223 >>> parse_size('1 KiB')
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224 1024
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225 >>> parse_size('1 KB', binary=True)
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226 1024
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227 >>> parse_size('1.5 GB')
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228 1500000000
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229 >>> parse_size('1.5 GB', binary=True)
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230 1610612736
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231 """
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232 tokens = tokenize(size)
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233 if tokens and isinstance(tokens[0], numbers.Number):
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234 # Get the normalized unit (if any) from the tokenized input.
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235 normalized_unit = tokens[1].lower() if len(tokens) == 2 and is_string(tokens[1]) else ''
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236 # If the input contains only a number, it's assumed to be the number of
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237 # bytes. The second token can also explicitly reference the unit bytes.
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238 if len(tokens) == 1 or normalized_unit.startswith('b'):
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239 return int(tokens[0])
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240 # Otherwise we expect two tokens: A number and a unit.
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241 if normalized_unit:
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242 # Convert plural units to singular units, for details:
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243 # https://github.com/xolox/python-humanfriendly/issues/26
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244 normalized_unit = normalized_unit.rstrip('s')
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245 for unit in disk_size_units:
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246 # First we check for unambiguous symbols (KiB, MiB, GiB, etc)
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247 # and names (kibibyte, mebibyte, gibibyte, etc) because their
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248 # handling is always the same.
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249 if normalized_unit in (unit.binary.symbol.lower(), unit.binary.name.lower()):
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250 return int(tokens[0] * unit.binary.divider)
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251 # Now we will deal with ambiguous prefixes (K, M, G, etc),
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252 # symbols (KB, MB, GB, etc) and names (kilobyte, megabyte,
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253 # gigabyte, etc) according to the caller's preference.
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254 if (normalized_unit in (unit.decimal.symbol.lower(), unit.decimal.name.lower()) or
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255 normalized_unit.startswith(unit.decimal.symbol[0].lower())):
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256 return int(tokens[0] * (unit.binary.divider if binary else unit.decimal.divider))
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257 # We failed to parse the size specification.
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258 msg = "Failed to parse size! (input %r was tokenized as %r)"
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259 raise InvalidSize(format(msg, size, tokens))
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260
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261
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262 def format_length(num_metres, keep_width=False):
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263 """
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264 Format a metre count as a human readable length.
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265
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266 :param num_metres: The length to format in metres (float / integer).
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267 :param keep_width: :data:`True` if trailing zeros should not be stripped,
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268 :data:`False` if they can be stripped.
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269 :returns: The corresponding human readable length (a string).
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270
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271 This function supports ranges from nanometres to kilometres.
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272
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273 Some examples:
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274
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275 >>> from humanfriendly import format_length
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276 >>> format_length(0)
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277 '0 metres'
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278 >>> format_length(1)
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279 '1 metre'
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280 >>> format_length(5)
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281 '5 metres'
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282 >>> format_length(1000)
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283 '1 km'
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284 >>> format_length(0.004)
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285 '4 mm'
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286 """
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287 for unit in reversed(length_size_units):
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288 if num_metres >= unit['divider']:
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289 number = round_number(float(num_metres) / unit['divider'], keep_width=keep_width)
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290 return pluralize(number, unit['singular'], unit['plural'])
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291 return pluralize(num_metres, 'metre')
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292
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293
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294 def parse_length(length):
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295 """
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296 Parse a human readable length and return the number of metres.
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297
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298 :param length: The human readable length to parse (a string).
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299 :returns: The corresponding length in metres (a float).
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300 :raises: :exc:`InvalidLength` when the input can't be parsed.
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301
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302 Some examples:
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303
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304 >>> from humanfriendly import parse_length
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305 >>> parse_length('42')
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306 42
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307 >>> parse_length('1 km')
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308 1000
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309 >>> parse_length('5mm')
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310 0.005
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311 >>> parse_length('15.3cm')
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312 0.153
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313 """
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314 tokens = tokenize(length)
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315 if tokens and isinstance(tokens[0], numbers.Number):
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316 # If the input contains only a number, it's assumed to be the number of metres.
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317 if len(tokens) == 1:
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318 return tokens[0]
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319 # Otherwise we expect to find two tokens: A number and a unit.
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320 if len(tokens) == 2 and is_string(tokens[1]):
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321 normalized_unit = tokens[1].lower()
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322 # Try to match the first letter of the unit.
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323 for unit in length_size_units:
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324 if normalized_unit.startswith(unit['prefix']):
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325 return tokens[0] * unit['divider']
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326 # We failed to parse the length specification.
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327 msg = "Failed to parse length! (input %r was tokenized as %r)"
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328 raise InvalidLength(format(msg, length, tokens))
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329
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330
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331 def format_number(number, num_decimals=2):
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332 """
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333 Format a number as a string including thousands separators.
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334
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335 :param number: The number to format (a number like an :class:`int`,
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336 :class:`long` or :class:`float`).
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337 :param num_decimals: The number of decimals to render (2 by default). If no
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338 decimal places are required to represent the number
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339 they will be omitted regardless of this argument.
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340 :returns: The formatted number (a string).
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341
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342 This function is intended to make it easier to recognize the order of size
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343 of the number being formatted.
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344
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345 Here's an example:
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346
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347 >>> from humanfriendly import format_number
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348 >>> print(format_number(6000000))
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349 6,000,000
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350 > print(format_number(6000000000.42))
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351 6,000,000,000.42
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352 > print(format_number(6000000000.42, num_decimals=0))
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353 6,000,000,000
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354 """
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355 integer_part, _, decimal_part = str(float(number)).partition('.')
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356 reversed_digits = ''.join(reversed(integer_part))
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357 parts = []
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358 while reversed_digits:
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359 parts.append(reversed_digits[:3])
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360 reversed_digits = reversed_digits[3:]
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361 formatted_number = ''.join(reversed(','.join(parts)))
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362 decimals_to_add = decimal_part[:num_decimals].rstrip('0')
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363 if decimals_to_add:
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364 formatted_number += '.' + decimals_to_add
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365 return formatted_number
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366
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367
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368 def round_number(count, keep_width=False):
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369 """
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370 Round a floating point number to two decimal places in a human friendly format.
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371
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372 :param count: The number to format.
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373 :param keep_width: :data:`True` if trailing zeros should not be stripped,
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374 :data:`False` if they can be stripped.
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375 :returns: The formatted number as a string. If no decimal places are
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376 required to represent the number, they will be omitted.
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377
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378 The main purpose of this function is to be used by functions like
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379 :func:`format_length()`, :func:`format_size()` and
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380 :func:`format_timespan()`.
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381
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382 Here are some examples:
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383
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384 >>> from humanfriendly import round_number
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385 >>> round_number(1)
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386 '1'
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387 >>> round_number(math.pi)
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388 '3.14'
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389 >>> round_number(5.001)
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390 '5'
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391 """
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392 text = '%.2f' % float(count)
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393 if not keep_width:
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394 text = re.sub('0+$', '', text)
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395 text = re.sub(r'\.$', '', text)
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396 return text
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397
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398
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399 def format_timespan(num_seconds, detailed=False, max_units=3):
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400 """
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401 Format a timespan in seconds as a human readable string.
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402
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403 :param num_seconds: Any value accepted by :func:`coerce_seconds()`.
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404 :param detailed: If :data:`True` milliseconds are represented separately
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405 instead of being represented as fractional seconds
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406 (defaults to :data:`False`).
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407 :param max_units: The maximum number of units to show in the formatted time
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408 span (an integer, defaults to three).
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409 :returns: The formatted timespan as a string.
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410 :raise: See :func:`coerce_seconds()`.
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411
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412 Some examples:
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413
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414 >>> from humanfriendly import format_timespan
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415 >>> format_timespan(0)
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416 '0 seconds'
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417 >>> format_timespan(1)
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418 '1 second'
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419 >>> import math
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420 >>> format_timespan(math.pi)
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421 '3.14 seconds'
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422 >>> hour = 60 * 60
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423 >>> day = hour * 24
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424 >>> week = day * 7
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425 >>> format_timespan(week * 52 + day * 2 + hour * 3)
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426 '1 year, 2 days and 3 hours'
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427 """
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428 num_seconds = coerce_seconds(num_seconds)
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429 if num_seconds < 60 and not detailed:
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430 # Fast path.
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431 return pluralize(round_number(num_seconds), 'second')
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432 else:
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433 # Slow path.
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434 result = []
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435 num_seconds = decimal.Decimal(str(num_seconds))
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436 relevant_units = list(reversed(time_units[0 if detailed else 3:]))
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437 for unit in relevant_units:
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438 # Extract the unit count from the remaining time.
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439 divider = decimal.Decimal(str(unit['divider']))
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440 count = num_seconds / divider
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441 num_seconds %= divider
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442 # Round the unit count appropriately.
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443 if unit != relevant_units[-1]:
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444 # Integer rounding for all but the smallest unit.
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445 count = int(count)
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446 else:
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447 # Floating point rounding for the smallest unit.
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448 count = round_number(count)
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449 # Only include relevant units in the result.
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450 if count not in (0, '0'):
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451 result.append(pluralize(count, unit['singular'], unit['plural']))
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452 if len(result) == 1:
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453 # A single count/unit combination.
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454 return result[0]
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455 else:
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456 if not detailed:
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457 # Remove `insignificant' data from the formatted timespan.
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458 result = result[:max_units]
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459 # Format the timespan in a readable way.
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460 return concatenate(result)
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461
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462
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463 def parse_timespan(timespan):
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464 """
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465 Parse a "human friendly" timespan into the number of seconds.
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466
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467 :param value: A string like ``5h`` (5 hours), ``10m`` (10 minutes) or
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468 ``42s`` (42 seconds).
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469 :returns: The number of seconds as a floating point number.
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470 :raises: :exc:`InvalidTimespan` when the input can't be parsed.
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471
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472 Note that the :func:`parse_timespan()` function is not meant to be the
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473 "mirror image" of the :func:`format_timespan()` function. Instead it's
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474 meant to allow humans to easily and succinctly specify a timespan with a
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475 minimal amount of typing. It's very useful to accept easy to write time
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476 spans as e.g. command line arguments to programs.
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477
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478 The time units (and abbreviations) supported by this function are:
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479
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480 - ms, millisecond, milliseconds
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481 - s, sec, secs, second, seconds
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482 - m, min, mins, minute, minutes
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483 - h, hour, hours
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484 - d, day, days
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485 - w, week, weeks
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486 - y, year, years
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487
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488 Some examples:
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489
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490 >>> from humanfriendly import parse_timespan
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491 >>> parse_timespan('42')
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492 42.0
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493 >>> parse_timespan('42s')
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494 42.0
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495 >>> parse_timespan('1m')
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496 60.0
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497 >>> parse_timespan('1h')
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498 3600.0
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499 >>> parse_timespan('1d')
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500 86400.0
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501 """
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502 tokens = tokenize(timespan)
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503 if tokens and isinstance(tokens[0], numbers.Number):
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504 # If the input contains only a number, it's assumed to be the number of seconds.
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505 if len(tokens) == 1:
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506 return float(tokens[0])
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507 # Otherwise we expect to find two tokens: A number and a unit.
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508 if len(tokens) == 2 and is_string(tokens[1]):
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509 normalized_unit = tokens[1].lower()
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510 for unit in time_units:
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511 if (normalized_unit == unit['singular'] or
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512 normalized_unit == unit['plural'] or
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513 normalized_unit in unit['abbreviations']):
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514 return float(tokens[0]) * unit['divider']
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515 # We failed to parse the timespan specification.
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516 msg = "Failed to parse timespan! (input %r was tokenized as %r)"
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517 raise InvalidTimespan(format(msg, timespan, tokens))
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518
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519
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520 def parse_date(datestring):
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521 """
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522 Parse a date/time string into a tuple of integers.
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523
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524 :param datestring: The date/time string to parse.
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525 :returns: A tuple with the numbers ``(year, month, day, hour, minute,
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526 second)`` (all numbers are integers).
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527 :raises: :exc:`InvalidDate` when the date cannot be parsed.
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528
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529 Supported date/time formats:
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530
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531 - ``YYYY-MM-DD``
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532 - ``YYYY-MM-DD HH:MM:SS``
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533
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534 .. note:: If you want to parse date/time strings with a fixed, known
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535 format and :func:`parse_date()` isn't useful to you, consider
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536 :func:`time.strptime()` or :meth:`datetime.datetime.strptime()`,
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537 both of which are included in the Python standard library.
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538 Alternatively for more complex tasks consider using the date/time
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539 parsing module in the dateutil_ package.
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540
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541 Examples:
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542
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543 >>> from humanfriendly import parse_date
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544 >>> parse_date('2013-06-17')
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545 (2013, 6, 17, 0, 0, 0)
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546 >>> parse_date('2013-06-17 02:47:42')
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547 (2013, 6, 17, 2, 47, 42)
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548
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549 Here's how you convert the result to a number (`Unix time`_):
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550
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551 >>> from humanfriendly import parse_date
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552 >>> from time import mktime
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553 >>> mktime(parse_date('2013-06-17 02:47:42') + (-1, -1, -1))
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554 1371430062.0
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555
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556 And here's how you convert it to a :class:`datetime.datetime` object:
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557
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558 >>> from humanfriendly import parse_date
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559 >>> from datetime import datetime
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560 >>> datetime(*parse_date('2013-06-17 02:47:42'))
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561 datetime.datetime(2013, 6, 17, 2, 47, 42)
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562
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563 Here's an example that combines :func:`format_timespan()` and
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564 :func:`parse_date()` to calculate a human friendly timespan since a
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565 given date:
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566
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567 >>> from humanfriendly import format_timespan, parse_date
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568 >>> from time import mktime, time
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569 >>> unix_time = mktime(parse_date('2013-06-17 02:47:42') + (-1, -1, -1))
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570 >>> seconds_since_then = time() - unix_time
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571 >>> print(format_timespan(seconds_since_then))
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572 1 year, 43 weeks and 1 day
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573
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574 .. _dateutil: https://dateutil.readthedocs.io/en/latest/parser.html
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575 .. _Unix time: http://en.wikipedia.org/wiki/Unix_time
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576 """
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577 try:
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578 tokens = [t.strip() for t in datestring.split()]
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579 if len(tokens) >= 2:
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580 date_parts = list(map(int, tokens[0].split('-'))) + [1, 1]
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581 time_parts = list(map(int, tokens[1].split(':'))) + [0, 0, 0]
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582 return tuple(date_parts[0:3] + time_parts[0:3])
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583 else:
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584 year, month, day = (list(map(int, datestring.split('-'))) + [1, 1])[0:3]
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585 return (year, month, day, 0, 0, 0)
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586 except Exception:
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587 msg = "Invalid date! (expected 'YYYY-MM-DD' or 'YYYY-MM-DD HH:MM:SS' but got: %r)"
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588 raise InvalidDate(format(msg, datestring))
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589
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590
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591 def format_path(pathname):
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592 """
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diff changeset
593 Shorten a pathname to make it more human friendly.
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594
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595 :param pathname: An absolute pathname (a string).
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596 :returns: The pathname with the user's home directory abbreviated.
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597
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diff changeset
598 Given an absolute pathname, this function abbreviates the user's home
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599 directory to ``~/`` in order to shorten the pathname without losing
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parents:
diff changeset
600 information. It is not an error if the pathname is not relative to the
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diff changeset
601 current user's home directory.
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602
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parents:
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603 Here's an example of its usage:
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604
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parents:
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605 >>> from os import environ
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parents:
diff changeset
606 >>> from os.path import join
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607 >>> vimrc = join(environ['HOME'], '.vimrc')
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parents:
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608 >>> vimrc
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609 '/home/peter/.vimrc'
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parents:
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610 >>> from humanfriendly import format_path
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611 >>> format_path(vimrc)
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612 '~/.vimrc'
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613 """
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614 pathname = os.path.abspath(pathname)
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615 home = os.environ.get('HOME')
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616 if home:
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617 home = os.path.abspath(home)
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618 if pathname.startswith(home):
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619 pathname = os.path.join('~', os.path.relpath(pathname, home))
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620 return pathname
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621
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622
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623 def parse_path(pathname):
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624 """
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625 Convert a human friendly pathname to an absolute pathname.
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626
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627 Expands leading tildes using :func:`os.path.expanduser()` and
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628 environment variables using :func:`os.path.expandvars()` and makes the
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629 resulting pathname absolute using :func:`os.path.abspath()`.
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630
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631 :param pathname: A human friendly pathname (a string).
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632 :returns: An absolute pathname (a string).
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633 """
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634 return os.path.abspath(os.path.expanduser(os.path.expandvars(pathname)))
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635
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636
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637 class Timer(object):
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638
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639 """
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640 Easy to use timer to keep track of long during operations.
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641 """
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642
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643 def __init__(self, start_time=None, resumable=False):
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644 """
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645 Remember the time when the :class:`Timer` was created.
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646
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647 :param start_time: The start time (a float, defaults to the current time).
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648 :param resumable: Create a resumable timer (defaults to :data:`False`).
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649
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650 When `start_time` is given :class:`Timer` uses :func:`time.time()` as a
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651 clock source, otherwise it uses :func:`humanfriendly.compat.monotonic()`.
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652 """
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653 if resumable:
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654 self.monotonic = True
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655 self.resumable = True
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656 self.start_time = 0.0
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657 self.total_time = 0.0
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658 elif start_time:
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659 self.monotonic = False
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660 self.resumable = False
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661 self.start_time = start_time
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662 else:
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663 self.monotonic = True
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664 self.resumable = False
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665 self.start_time = monotonic()
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666
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667 def __enter__(self):
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668 """
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669 Start or resume counting elapsed time.
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670
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671 :returns: The :class:`Timer` object.
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672 :raises: :exc:`~exceptions.ValueError` when the timer isn't resumable.
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673 """
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674 if not self.resumable:
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675 raise ValueError("Timer is not resumable!")
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676 self.start_time = monotonic()
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677 return self
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diff changeset
678
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679 def __exit__(self, exc_type=None, exc_value=None, traceback=None):
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680 """
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681 Stop counting elapsed time.
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diff changeset
682
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683 :raises: :exc:`~exceptions.ValueError` when the timer isn't resumable.
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684 """
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685 if not self.resumable:
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diff changeset
686 raise ValueError("Timer is not resumable!")
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687 if self.start_time:
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688 self.total_time += monotonic() - self.start_time
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689 self.start_time = 0.0
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diff changeset
690
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691 def sleep(self, seconds):
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692 """
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diff changeset
693 Easy to use rate limiting of repeating actions.
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diff changeset
694
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diff changeset
695 :param seconds: The number of seconds to sleep (an
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diff changeset
696 integer or floating point number).
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diff changeset
697
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diff changeset
698 This method sleeps for the given number of seconds minus the
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parents:
diff changeset
699 :attr:`elapsed_time`. If the resulting duration is negative
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parents:
diff changeset
700 :func:`time.sleep()` will still be called, but the argument
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701 given to it will be the number 0 (negative numbers cause
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diff changeset
702 :func:`time.sleep()` to raise an exception).
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diff changeset
703
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diff changeset
704 The use case for this is to initialize a :class:`Timer` inside
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parents:
diff changeset
705 the body of a :keyword:`for` or :keyword:`while` loop and call
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parents:
diff changeset
706 :func:`Timer.sleep()` at the end of the loop body to rate limit
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parents:
diff changeset
707 whatever it is that is being done inside the loop body.
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parents:
diff changeset
708
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parents:
diff changeset
709 For posterity: Although the implementation of :func:`sleep()` only
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parents:
diff changeset
710 requires a single line of code I've added it to :mod:`humanfriendly`
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parents:
diff changeset
711 anyway because now that I've thought about how to tackle this once I
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parents:
diff changeset
712 never want to have to think about it again :-P (unless I find ways to
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parents:
diff changeset
713 improve this).
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parents:
diff changeset
714 """
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parents:
diff changeset
715 time.sleep(max(0, seconds - self.elapsed_time))
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parents:
diff changeset
716
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parents:
diff changeset
717 @property
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parents:
diff changeset
718 def elapsed_time(self):
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parents:
diff changeset
719 """
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parents:
diff changeset
720 Get the number of seconds counted so far.
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parents:
diff changeset
721 """
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parents:
diff changeset
722 elapsed_time = 0
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parents:
diff changeset
723 if self.resumable:
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parents:
diff changeset
724 elapsed_time += self.total_time
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parents:
diff changeset
725 if self.start_time:
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parents:
diff changeset
726 current_time = monotonic() if self.monotonic else time.time()
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parents:
diff changeset
727 elapsed_time += current_time - self.start_time
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parents:
diff changeset
728 return elapsed_time
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parents:
diff changeset
729
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parents:
diff changeset
730 @property
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parents:
diff changeset
731 def rounded(self):
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parents:
diff changeset
732 """Human readable timespan rounded to seconds (a string)."""
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
733 return format_timespan(round(self.elapsed_time))
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parents:
diff changeset
734
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parents:
diff changeset
735 def __str__(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
736 """Show the elapsed time since the :class:`Timer` was created."""
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parents:
diff changeset
737 return format_timespan(self.elapsed_time)
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parents:
diff changeset
738
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parents:
diff changeset
739
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parents:
diff changeset
740 class InvalidDate(Exception):
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parents:
diff changeset
741
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parents:
diff changeset
742 """
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parents:
diff changeset
743 Raised when a string cannot be parsed into a date.
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parents:
diff changeset
744
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parents:
diff changeset
745 For example:
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parents:
diff changeset
746
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parents:
diff changeset
747 >>> from humanfriendly import parse_date
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parents:
diff changeset
748 >>> parse_date('2013-06-XY')
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parents:
diff changeset
749 Traceback (most recent call last):
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parents:
diff changeset
750 File "humanfriendly.py", line 206, in parse_date
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
751 raise InvalidDate(format(msg, datestring))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
752 humanfriendly.InvalidDate: Invalid date! (expected 'YYYY-MM-DD' or 'YYYY-MM-DD HH:MM:SS' but got: '2013-06-XY')
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parents:
diff changeset
753 """
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parents:
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754
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parents:
diff changeset
755
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parents:
diff changeset
756 class InvalidSize(Exception):
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parents:
diff changeset
757
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parents:
diff changeset
758 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
759 Raised when a string cannot be parsed into a file size.
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parents:
diff changeset
760
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
761 For example:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
762
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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763 >>> from humanfriendly import parse_size
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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764 >>> parse_size('5 Z')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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765 Traceback (most recent call last):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
766 File "humanfriendly/__init__.py", line 267, in parse_size
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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767 raise InvalidSize(format(msg, size, tokens))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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diff changeset
768 humanfriendly.InvalidSize: Failed to parse size! (input '5 Z' was tokenized as [5, 'Z'])
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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769 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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770
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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771
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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772 class InvalidLength(Exception):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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773
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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774 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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775 Raised when a string cannot be parsed into a length.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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776
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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diff changeset
777 For example:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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778
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
779 >>> from humanfriendly import parse_length
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
780 >>> parse_length('5 Z')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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781 Traceback (most recent call last):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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782 File "humanfriendly/__init__.py", line 267, in parse_length
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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diff changeset
783 raise InvalidLength(format(msg, length, tokens))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
784 humanfriendly.InvalidLength: Failed to parse length! (input '5 Z' was tokenized as [5, 'Z'])
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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785 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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diff changeset
786
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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787
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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788 class InvalidTimespan(Exception):
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diff changeset
789
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
790 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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diff changeset
791 Raised when a string cannot be parsed into a timespan.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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diff changeset
792
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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diff changeset
793 For example:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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diff changeset
794
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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diff changeset
795 >>> from humanfriendly import parse_timespan
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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diff changeset
796 >>> parse_timespan('1 age')
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
797 Traceback (most recent call last):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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diff changeset
798 File "humanfriendly/__init__.py", line 419, in parse_timespan
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
799 raise InvalidTimespan(format(msg, timespan, tokens))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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diff changeset
800 humanfriendly.InvalidTimespan: Failed to parse timespan! (input '1 age' was tokenized as [1, 'age'])
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
801 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
802
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
803
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
804 # Define aliases for backwards compatibility.
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diff changeset
805 define_aliases(
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diff changeset
806 module_name=__name__,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
807 # In humanfriendly 1.23 the format_table() function was added to render a
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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diff changeset
808 # table using characters like dashes and vertical bars to emulate borders.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
809 # Since then support for other tables has been added and the name of
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
810 # format_table() has changed.
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diff changeset
811 format_table='humanfriendly.tables.format_pretty_table',
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
812 # In humanfriendly 1.30 the following text manipulation functions were
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
813 # moved out into a separate module to enable their usage in other modules
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shellac
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diff changeset
814 # of the humanfriendly package (without causing circular imports).
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diff changeset
815 compact='humanfriendly.text.compact',
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diff changeset
816 concatenate='humanfriendly.text.concatenate',
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817 dedent='humanfriendly.text.dedent',
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818 format='humanfriendly.text.format',
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diff changeset
819 is_empty_line='humanfriendly.text.is_empty_line',
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
820 pluralize='humanfriendly.text.pluralize',
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diff changeset
821 tokenize='humanfriendly.text.tokenize',
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diff changeset
822 trim_empty_lines='humanfriendly.text.trim_empty_lines',
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
823 # In humanfriendly 1.38 the prompt_for_choice() function was moved out into a
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
824 # separate module because several variants of interactive prompts were added.
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diff changeset
825 prompt_for_choice='humanfriendly.prompts.prompt_for_choice',
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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diff changeset
826 # In humanfriendly 8.0 the Spinner class and minimum_spinner_interval
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
827 # variable were extracted to a new module and the erase_line_code,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
828 # hide_cursor_code and show_cursor_code variables were moved.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
829 AutomaticSpinner='humanfriendly.terminal.spinners.AutomaticSpinner',
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shellac
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diff changeset
830 Spinner='humanfriendly.terminal.spinners.Spinner',
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shellac
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diff changeset
831 erase_line_code='humanfriendly.terminal.ANSI_ERASE_LINE',
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diff changeset
832 hide_cursor_code='humanfriendly.terminal.ANSI_SHOW_CURSOR',
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diff changeset
833 minimum_spinner_interval='humanfriendly.terminal.spinners.MINIMUM_INTERVAL',
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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diff changeset
834 show_cursor_code='humanfriendly.terminal.ANSI_HIDE_CURSOR',
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835 )