Mercurial > babel > old > babel-test

annotate babel/support.py @ 508:dbb70d75718a stable-0.9.x

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Fix Python 2.3 compatibility for 0.9 branch (closes #233)
author fschwarz
date Fri, 04 Mar 2011 14:16:15 +0000
parents d1a27b087ea4
children
rev   line source
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da7efa40a9e2 Move `Translations` and `LazyProxy` to new `babel.support` module, which should contain any convenience code that is useful for applications using Babel/I18n, but not used by Babel itself.
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1 # -*- coding: utf-8 -*-
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2 #
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3 # Copyright (C) 2007 Edgewall Software
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4 # All rights reserved.
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5 #
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6 # This software is licensed as described in the file COPYING, which
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7 # you should have received as part of this distribution. The terms
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8 # are also available at http://babel.edgewall.org/wiki/License.
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9 #
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10 # This software consists of voluntary contributions made by many
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11 # individuals. For the exact contribution history, see the revision
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12 # history and logs, available at http://babel.edgewall.org/log/.
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14 """Several classes and functions that help with integrating and using Babel
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15 in applications.
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17 .. note: the code in this module is not used by Babel itself
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18 """
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19
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20 from datetime import date, datetime, time
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21 import gettext
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22
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23 from babel.core import Locale
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24 from babel.dates import format_date, format_datetime, format_time, LC_TIME
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25 from babel.numbers import format_number, format_decimal, format_currency, \
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26 format_percent, format_scientific, LC_NUMERIC
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dbb70d75718a Fix Python 2.3 compatibility for 0.9 branch (closes #233)
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27 from babel.util import set, UTC
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28
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29 __all__ = ['Format', 'LazyProxy', 'Translations']
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30 __docformat__ = 'restructuredtext en'
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31
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32
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33 class Format(object):
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34 """Wrapper class providing the various date and number formatting functions
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35 bound to a specific locale and time-zone.
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36
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37 >>> fmt = Format('en_US', UTC)
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38 >>> fmt.date(date(2007, 4, 1))
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39 u'Apr 1, 2007'
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40 >>> fmt.decimal(1.2345)
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41 u'1.234'
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42 """
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43
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44 def __init__(self, locale, tzinfo=None):
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45 """Initialize the formatter.
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46
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47 :param locale: the locale identifier or `Locale` instance
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48 :param tzinfo: the time-zone info (a `tzinfo` instance or `None`)
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49 """
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50 self.locale = Locale.parse(locale)
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51 self.tzinfo = tzinfo
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52
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53 def date(self, date=None, format='medium'):
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54 """Return a date formatted according to the given pattern.
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55
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56 >>> fmt = Format('en_US')
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57 >>> fmt.date(date(2007, 4, 1))
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58 u'Apr 1, 2007'
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59
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60 :see: `babel.dates.format_date`
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61 """
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62 return format_date(date, format, locale=self.locale)
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63
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64 def datetime(self, datetime=None, format='medium'):
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65 """Return a date and time formatted according to the given pattern.
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66
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67 >>> from pytz import timezone
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68 >>> fmt = Format('en_US', tzinfo=timezone('US/Eastern'))
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69 >>> fmt.datetime(datetime(2007, 4, 1, 15, 30))
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70 u'Apr 1, 2007 11:30:00 AM'
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71
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72 :see: `babel.dates.format_datetime`
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73 """
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74 return format_datetime(datetime, format, tzinfo=self.tzinfo,
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75 locale=self.locale)
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76
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77 def time(self, time=None, format='medium'):
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78 """Return a time formatted according to the given pattern.
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79
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80 >>> from pytz import timezone
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81 >>> fmt = Format('en_US', tzinfo=timezone('US/Eastern'))
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82 >>> fmt.time(datetime(2007, 4, 1, 15, 30))
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83 u'11:30:00 AM'
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84
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85 :see: `babel.dates.format_time`
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86 """
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87 return format_time(time, format, tzinfo=self.tzinfo, locale=self.locale)
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88
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89 def number(self, number):
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90 """Return an integer number formatted for the locale.
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91
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92 >>> fmt = Format('en_US')
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93 >>> fmt.number(1099)
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94 u'1,099'
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95
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96 :see: `babel.numbers.format_number`
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97 """
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98 return format_number(number, locale=self.locale)
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99
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100 def decimal(self, number, format=None):
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101 """Return a decimal number formatted for the locale.
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102
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103 >>> fmt = Format('en_US')
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104 >>> fmt.decimal(1.2345)
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105 u'1.234'
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106
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107 :see: `babel.numbers.format_decimal`
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108 """
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109 return format_decimal(number, format, locale=self.locale)
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110
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111 def currency(self, number, currency):
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112 """Return a number in the given currency formatted for the locale.
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113
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114 :see: `babel.numbers.format_currency`
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115 """
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116 return format_currency(number, currency, locale=self.locale)
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117
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118 def percent(self, number, format=None):
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119 """Return a number formatted as percentage for the locale.
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120
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121 >>> fmt = Format('en_US')
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122 >>> fmt.percent(0.34)
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123 u'34%'
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124
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125 :see: `babel.numbers.format_percent`
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126 """
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127 return format_percent(number, format, locale=self.locale)
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128
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129 def scientific(self, number):
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130 """Return a number formatted using scientific notation for the locale.
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131
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132 :see: `babel.numbers.format_scientific`
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133 """
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134 return format_scientific(number, locale=self.locale)
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135
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136
61
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137 class LazyProxy(object):
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138 """Class for proxy objects that delegate to a specified function to evaluate
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139 the actual object.
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140
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141 >>> def greeting(name='world'):
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142 ... return 'Hello, %s!' % name
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143 >>> lazy_greeting = LazyProxy(greeting, name='Joe')
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144 >>> print lazy_greeting
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145 Hello, Joe!
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146 >>> u' ' + lazy_greeting
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147 u' Hello, Joe!'
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148 >>> u'(%s)' % lazy_greeting
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149 u'(Hello, Joe!)'
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150
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151 This can be used, for example, to implement lazy translation functions that
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152 delay the actual translation until the string is actually used. The
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153 rationale for such behavior is that the locale of the user may not always
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154 be available. In web applications, you only know the locale when processing
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155 a request.
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156
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157 The proxy implementation attempts to be as complete as possible, so that
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158 the lazy objects should mostly work as expected, for example for sorting:
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159
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160 >>> greetings = [
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161 ... LazyProxy(greeting, 'world'),
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162 ... LazyProxy(greeting, 'Joe'),
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163 ... LazyProxy(greeting, 'universe'),
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164 ... ]
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165 >>> greetings.sort()
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166 >>> for greeting in greetings:
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167 ... print greeting
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168 Hello, Joe!
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169 Hello, universe!
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170 Hello, world!
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171 """
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172 __slots__ = ['_func', '_args', '_kwargs', '_value']
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173
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174 def __init__(self, func, *args, **kwargs):
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175 # Avoid triggering our own __setattr__ implementation
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176 object.__setattr__(self, '_func', func)
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177 object.__setattr__(self, '_args', args)
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178 object.__setattr__(self, '_kwargs', kwargs)
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179 object.__setattr__(self, '_value', None)
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180
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181 def value(self):
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182 if self._value is None:
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183 value = self._func(*self._args, **self._kwargs)
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184 object.__setattr__(self, '_value', value)
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185 return self._value
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186 value = property(value)
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187
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188 def __contains__(self, key):
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189 return key in self.value
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190
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191 def __nonzero__(self):
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192 return bool(self.value)
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193
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194 def __dir__(self):
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195 return dir(self.value)
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196
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197 def __iter__(self):
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198 return iter(self.value)
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199
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200 def __len__(self):
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201 return len(self.value)
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202
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203 def __str__(self):
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204 return str(self.value)
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205
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206 def __unicode__(self):
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207 return unicode(self.value)
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208
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209 def __add__(self, other):
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210 return self.value + other
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211
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212 def __radd__(self, other):
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213 return other + self.value
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214
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215 def __mod__(self, other):
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216 return self.value % other
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217
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218 def __rmod__(self, other):
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219 return other % self.value
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220
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221 def __mul__(self, other):
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222 return self.value * other
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223
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224 def __rmul__(self, other):
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225 return other * self.value
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226
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227 def __call__(self, *args, **kwargs):
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228 return self.value(*args, **kwargs)
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229
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230 def __lt__(self, other):
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231 return self.value < other
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232
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233 def __le__(self, other):
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234 return self.value <= other
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235
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236 def __eq__(self, other):
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237 return self.value == other
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238
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239 def __ne__(self, other):
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240 return self.value != other
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241
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242 def __gt__(self, other):
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243 return self.value > other
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244
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245 def __ge__(self, other):
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246 return self.value >= other
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247
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248 def __delattr__(self, name):
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249 delattr(self.value, name)
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250
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251 def __getattr__(self, name):
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252 return getattr(self.value, name)
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253
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254 def __setattr__(self, name, value):
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255 setattr(self.value, name, value)
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256
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257 def __delitem__(self, key):
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258 del self.value[key]
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259
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260 def __getitem__(self, key):
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261 return self.value[key]
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262
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263 def __setitem__(self, key, value):
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264 self.value[key] = value
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265
407
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266
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267 class Translations(gettext.GNUTranslations, object):
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268 """An extended translation catalog class."""
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269
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270 DEFAULT_DOMAIN = 'messages'
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271
413
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272 def __init__(self, fileobj=None, domain=DEFAULT_DOMAIN):
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273 """Initialize the translations catalog.
413
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274
61
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275 :param fileobj: the file-like object the translation should be read
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276 from
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277 """
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278 gettext.GNUTranslations.__init__(self, fp=fileobj)
346
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279 self.files = filter(None, [getattr(fileobj, 'name', None)])
413
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280 self.domain = domain
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281 self._domains = {}
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282
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283 def load(cls, dirname=None, locales=None, domain=DEFAULT_DOMAIN):
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284 """Load translations from the given directory.
413
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285
61
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286 :param dirname: the directory containing the ``MO`` files
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287 :param locales: the list of locales in order of preference (items in
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288 this list can be either `Locale` objects or locale
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289 strings)
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290 :param domain: the message domain
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291 :return: the loaded catalog, or a ``NullTranslations`` instance if no
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292 matching translations were found
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293 :rtype: `Translations`
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294 """
346
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295 if locales is not None:
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296 if not isinstance(locales, (list, tuple)):
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297 locales = [locales]
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298 locales = [str(locale) for locale in locales]
413
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299 if not domain:
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300 domain = cls.DEFAULT_DOMAIN
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301 filename = gettext.find(domain, dirname, locales)
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302 if not filename:
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303 return gettext.NullTranslations()
413
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304 return cls(fileobj=open(filename, 'rb'), domain=domain)
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305 load = classmethod(load)
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306
413
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307 def __repr__(self):
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308 return '<%s: "%s">' % (type(self).__name__,
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309 self._info.get('project-id-version'))
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310
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311 def add(self, translations, merge=True):
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312 """Add the given translations to the catalog.
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313
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314 If the domain of the translations is different than that of the
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315 current catalog, they are added as a catalog that is only accessible
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316 by the various ``d*gettext`` functions.
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317
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318 :param translations: the `Translations` instance with the messages to
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319 add
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320 :param merge: whether translations for message domains that have
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321 already been added should be merged with the existing
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322 translations
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323 :return: the `Translations` instance (``self``) so that `merge` calls
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324 can be easily chained
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325 :rtype: `Translations`
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326 """
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327 domain = getattr(translations, 'domain', self.DEFAULT_DOMAIN)
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328 if merge and domain == self.domain:
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329 return self.merge(translations)
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330
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331 existing = self._domains.get(domain)
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332 if merge and existing is not None:
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333 existing.merge(translations)
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334 else:
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335 translations.add_fallback(self)
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336 self._domains[domain] = translations
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337
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338 return self
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339
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340 def merge(self, translations):
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341 """Merge the given translations into the catalog.
413
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342
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343 Message translations in the specified catalog override any messages
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344 with the same identifier in the existing catalog.
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345
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346 :param translations: the `Translations` instance with the messages to
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347 merge
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348 :return: the `Translations` instance (``self``) so that `merge` calls
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349 can be easily chained
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350 :rtype: `Translations`
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351 """
413
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352 if isinstance(translations, gettext.GNUTranslations):
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353 self._catalog.update(translations._catalog)
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354 if isinstance(translations, Translations):
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355 self.files.extend(translations.files)
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356
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357 return self
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358
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359 def dgettext(self, domain, message):
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360 """Like ``gettext()``, but look the message up in the specified
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361 domain.
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362 """
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363 return self._domains.get(domain, self).gettext(message)
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364
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365 def ldgettext(self, domain, message):
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366 """Like ``lgettext()``, but look the message up in the specified
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367 domain.
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368 """
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369 return self._domains.get(domain, self).lgettext(message)
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370
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371 def dugettext(self, domain, message):
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372 """Like ``ugettext()``, but look the message up in the specified
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373 domain.
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374 """
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375 return self._domains.get(domain, self).ugettext(message)
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376
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377 def dngettext(self, domain, singular, plural, num):
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378 """Like ``ngettext()``, but look the message up in the specified
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379 domain.
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380 """
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381 return self._domains.get(domain, self).ngettext(singular, plural, num)
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382
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383 def ldngettext(self, domain, singular, plural, num):
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384 """Like ``lngettext()``, but look the message up in the specified
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385 domain.
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386 """
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387 return self._domains.get(domain, self).lngettext(singular, plural, num)
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388
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389 def dungettext(self, domain, singular, plural, num):
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390 """Like ``ungettext()`` but look the message up in the specified
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391 domain.
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392 """
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393 return self._domains.get(domain, self).ungettext(singular, plural, num)
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