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annotate doc/formatting.txt @ 32:48cf004aa357

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Started docs on number formatting/parsing.
author cmlenz
date Mon, 04 Jun 2007 12:06:25 +0000
parents b6ff3e4b43e5
children 3666f3d3df15
rev   line source
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1 .. -*- mode: rst; encoding: utf-8 -*-
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2
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3 ==========================
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4 Number and Date Formatting
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5 ==========================
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6
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7
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8 .. contents:: Contents
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9 :depth: 2
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10 .. sectnum::
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11
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12
18
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13 Date Formatting
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14 ===============
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15
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16 When working with date and time information in Python, you commonly use the
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17 classes ``date``, ``datetime`` and/or ``time`` from the `datetime package`_.
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18 Babel provides functions for locale-specific formatting of those objects in its
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19 ``dates`` module::
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20
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21 >>> from datetime import date, datetime, time
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22 >>> from babel.dates import format_date, format_datetime, format_time
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23
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24 >>> d = date(2007, 4, 1)
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25 >>> format_date(d, locale='en')
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26 u'Apr 1, 2007'
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27 >>> format_date(d, locale='de_DE')
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28 u'01.04.2007'
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29
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30 As this example demonstrates, Babel will automatically choose a date format
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31 that is appropriate for the requested locale.
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32
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33 The ``format_*()`` functions also accept an optional ``format`` argument, which
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34 allows you to choose between one of four format variations:
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35
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36 * ``short``,
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37 * ``medium`` (the default),
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38 * ``long``, and
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39 * ``full``.
18
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40
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41 For example::
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42
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43 >>> format_date(d, format='short', locale='en')
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44 u'4/1/07'
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45 >>> format_date(d, format='long', locale='en')
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46 u'April 1, 2007'
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47 >>> format_date(d, format='full', locale='en')
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48 u'Sunday, April 1, 2007'
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49
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50 .. _`datetime package`: http://docs.python.org/lib/module-datetime.html
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51
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52
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53 Pattern Syntax
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54 --------------
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55
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56 While Babel makes it simple to use the appropriate date/time format for a given
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57 locale, you can also force it to use custom patterns. Note that Babel uses
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58 different patterns for specifying number and date formats compared to the
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59 Python equivalents (such as ``time.strftime()``), which have mostly been
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60 inherited from C and POSIX. The patterns used in Babel are based on the
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61 `Locale Data Markup Language specification`_ (LDML), which defines them as
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62 follows:
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63
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64 A date/time pattern is a string of characters, where specific strings of
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65 characters are replaced with date and time data from a calendar when formatting
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66 or used to generate data for a calendar when parsing. […]
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67
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68 Characters may be used multiple times. For example, if ``y`` is used for the
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69 year, ``yy`` might produce "99", whereas ``yyyy`` produces "1999". For most
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70 numerical fields, the number of characters specifies the field width. For
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71 example, if ``h`` is the hour, ``h`` might produce "5", but ``hh`` produces
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72 "05". For some characters, the count specifies whether an abbreviated or full
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73 form should be used […]
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74
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75 Two single quotes represent a literal single quote, either inside or outside
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76 single quotes. Text within single quotes is not interpreted in any way (except
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77 for two adjacent single quotes).
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78
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79 For example::
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80
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81 >>> d = date(2007, 4, 1)
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82 >>> format_date(d, "EEE, MMM d, ''yy", locale='en')
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83 u"Sun, Apr 1, '07"
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84 >>> format_date(d, "EEEE, d.M.yyyy", locale='de')
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85 u'Sonntag, 1.4.2007'
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86
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87 >>> t = time(15, 30)
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88 >>> format_time(t, "hh 'o''clock' a", locale='en')
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89 u"03 o'clock PM"
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90 >>> format_time(t, 'H:mm a', locale='de')
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91 u'15:30 nachm.'
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92
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93 >>> dt = datetime(2007, 4, 1, 15, 30)
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94 >>> format_datetime(dt, "yyyyy.MMMM.dd GGG hh:mm a", locale='en')
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95 u'02007.April.01 AD 03:30 PM'
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96
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97 The syntax for custom datetime format patterns is described in detail in the
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98 the `Locale Data Markup Language specification`_. The following table is just a
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99 relatively brief overview.
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100
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101 .. _`Locale Data Markup Language specification`: http://unicode.org/reports/tr35/#Date_Format_Patterns
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102
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103 -----------
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104 Date Fields
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105 -----------
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106
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107 +----------+--------+--------------------------------------------------------+
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108 | Field | Symbol | Description |
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109 +==========+========+========================================================+
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110 | Era | ``G`` | Replaced with the era string for the current date. One |
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111 | | | to three letters for the abbreviated form, four |
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112 | | | lettersfor the long form, five for the narrow form |
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113 +----------+--------+--------------------------------------------------------+
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114 | Year | ``y`` | Replaced by the year. Normally the length specifies |
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115 | | | the padding, but for two letters it also specifies the |
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116 | | | maximum length. |
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117 | +--------+--------------------------------------------------------+
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118 | | ``Y`` | Same as ``y`` but uses the ISO year-week calendar. |
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119 | +--------+--------------------------------------------------------+
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120 | | ``u`` | ?? |
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121 +----------+--------+--------------------------------------------------------+
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122 | Quarter | ``Q`` | Use one or two for the numerical quarter, three for |
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123 | | | the abbreviation, or four for the full name. |
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124 | +--------+--------------------------------------------------------+
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125 | | ``q`` | Use one or two for the numerical quarter, three for |
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126 | | | the abbreviation, or four for the full name. |
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127 +----------+--------+--------------------------------------------------------+
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128 | Month | ``M`` | Use one or two for the numerical month, three for the |
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129 | | | abbreviation, or four for the full name, or five for |
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130 | | | the narrow name. |
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131 | +--------+--------------------------------------------------------+
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132 | | ``L`` | Use one or two for the numerical month, three for the |
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133 | | | abbreviation, or four for the full name, or 5 for the |
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134 | | | narrow name. |
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135 +----------+--------+--------------------------------------------------------+
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136 | Week | ``w`` | Week of year. |
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137 | +--------+--------------------------------------------------------+
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138 | | ``W`` | Week of month. |
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139 +----------+--------+--------------------------------------------------------+
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140 | Day | ``d`` | Day of month. |
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141 | +--------+--------------------------------------------------------+
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142 | | ``D`` | Day of year. |
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143 | +--------+--------------------------------------------------------+
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144 | | ``F`` | Day of week in month. |
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145 | +--------+--------------------------------------------------------+
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146 | | ``g`` | ?? |
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147 +----------+--------+--------------------------------------------------------+
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148 | Week day | ``E`` | Day of week. Use one through three letters for the |
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149 | | | short day, or four for the full name, or five for the |
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150 | | | narrow name. |
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151 | +--------+--------------------------------------------------------+
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152 | | ``e`` | Local day of week. Same as E except adds a numeric |
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153 | | | value that will depend on the local starting day of |
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154 | | | the week, using one or two letters. |
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155 | +--------+--------------------------------------------------------+
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156 | | ``c`` | ?? |
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157 +----------+--------+--------------------------------------------------------+
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158
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159 -----------
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160 Time Fields
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161 -----------
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162
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163 +----------+--------+--------------------------------------------------------+
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164 | Field | Symbol | Description |
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165 +==========+========+========================================================+
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166 | Period | ``a`` | AM or PM |
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167 +----------+--------+--------------------------------------------------------+
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168 | Hour | ``h`` | Hour [1-12]. |
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169 | +--------+--------------------------------------------------------+
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170 | | ``H`` | Hour [0-23]. |
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171 | +--------+--------------------------------------------------------+
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172 | | ``K`` | Hour [0-11]. |
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173 | +--------+--------------------------------------------------------+
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174 | | ``k`` | Hour [1-24]. |
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175 +----------+--------+--------------------------------------------------------+
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176 | Minute | ``m`` | Use one or two for zero places padding. |
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177 +----------+--------+--------------------------------------------------------+
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178 | Second | ``s`` | Use one or two for zero places padding. |
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179 | +--------+--------------------------------------------------------+
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180 | | ``S`` | Fractional second, rounds to the count of letters. |
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181 | +--------+--------------------------------------------------------+
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182 | | ``A`` | Milliseconds in day. |
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183 +----------+--------+--------------------------------------------------------+
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184 | Timezone | ``z`` | Use one to three letters for the short timezone or |
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185 | | | four for the full name. |
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186 | +--------+--------------------------------------------------------+
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187 | | ``Z`` | Use one to three letters for RFC 822, four letters for |
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188 | | | GMT format. |
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189 | +--------+--------------------------------------------------------+
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190 | | ``v`` | Use one letter for short wall (generic) time, four for |
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191 | | | long wall time. |
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192 +----------+--------+--------------------------------------------------------+
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193
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194
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195 Time-Zone Support
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196 -----------------
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197
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198 Many of the verbose time formats include the time-zone, but time-zone
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199 information is not by default available for the Python ``datetime`` and
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200 ``time`` objects. The standard library includes only the abstract ``tzinfo``
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201 class, which you need appropriate implementations for to actually use in your
29
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202 application. Babel includes a ``tzinfo`` implementation for UTC (Universal
31
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203 Time).
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204
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205 For real time-zone support, it is strongly recommended that you use the
29
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206 third-party package `pytz`_, which includes the definitions of practically all
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207 of the time-zones used on the world, as well as important functions for
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208 reliably converting from UTC to local time, and vice versa::
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209
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210 >>> from datetime import time
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211 >>> t = time(15, 30)
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212
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213 >>> from pytz import timezone
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214 >>> cet = timezone('Europe/Berlin')
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215 >>> format_time(t, 'H:mm Z', tzinfo=cet, locale='de_DE')
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216 u'15:30 +0100'
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217
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218 The recommended approach to deal with different time-zones in a Python
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219 application is to always use UTC internally, and only convert from/to the users
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220 time-zone when accepting user input and displaying date/time data, respectively.
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221
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222 .. _`pytz`: http://pytz.sourceforge.net/
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223
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224
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225
18
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226 Parsing Dates
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227 -------------
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228
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229 Babel can also parse date and time information in a locale-sensitive manner::
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230
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231 >>> from babel.dates import parse_date, parse_datetime, parse_time
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232
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233
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234 Number Formatting
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235 =================
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236
32
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237 Support for locale-specific formatting and parsing of numbers is provided by
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238 the ``babel.numbers`` module::
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239
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240 >>> from babel.numbers import format_number, format_decimal, format_percent
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241
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242 Examples::
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243
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244 >>> format_decimal(1.2345, locale='en_US')
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245 u'1.234'
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246 >>> format_decimal(1.2345, locale='sv_SE')
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247 u'1,234'
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248 >>> format_decimal(12345, locale='de_DE')
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249 u'12.345'
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250
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251
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252 Pattern Syntax
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253 --------------
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254
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255 While Babel makes it simple to use the appropriate number format for a given
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256 locale, you can also force it to use custom patterns. As with date/time
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257 formatting patterns, the patterns Babel supports for number formatting are
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258 based on the `Locale Data Markup Language specification`_ (LDML).
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259
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260 Examples::
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261
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262 >>> format_decimal(-1.2345, format='#,##0.##;-#', locale='en')
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263 u'-1.23'
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264 >>> format_decimal(-1.2345, format='#,##0.##;(#)', locale='en')
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265 u'(1.23)'
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266
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267 The syntax for custom number format patterns is described in detail in the
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268 the specification. The following table is just a relatively brief overview.
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269
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270 +----------+-----------------------------------------------------------------+
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271 | Symbol | Description |
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272 +==========+=================================================================+
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273 | ``0`` | Digit |
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274 +----------+-----------------------------------------------------------------+
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275 | ``1-9`` | '1' through '9' indicate rounding. |
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276 +----------+-----------------------------------------------------------------+
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277 | ``@`` | Significant digit |
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278 +----------+-----------------------------------------------------------------+
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279 | ``#`` | Digit, zero shows as absent |
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280 +----------+-----------------------------------------------------------------+
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281 | ``.`` | Decimal separator or monetary decimal separator |
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282 +----------+-----------------------------------------------------------------+
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283 | ``-`` | Minus sign |
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284 +----------+-----------------------------------------------------------------+
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285 | ``,`` | Grouping separator |
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286 +----------+-----------------------------------------------------------------+
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287 | ``E`` | Separates mantissa and exponent in scientific notation |
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288 +----------+-----------------------------------------------------------------+
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289 | ``+`` | Prefix positive exponents with localized plus sign |
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290 +----------+-----------------------------------------------------------------+
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291 | ``;`` | Separates positive and negative subpatterns |
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292 +----------+-----------------------------------------------------------------+
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293 | ``%`` | Multiply by 100 and show as percentage |
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294 +----------+-----------------------------------------------------------------+
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295 | ``‰`` | Multiply by 1000 and show as per mille |
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296 +----------+-----------------------------------------------------------------+
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297 | ``¤`` | Currency sign, replaced by currency symbol. If doubled, |
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298 | | replaced by international currency symbol. If tripled, uses the |
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299 | | long form of the decimal symbol. |
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300 +----------+-----------------------------------------------------------------+
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301 | ``'`` | Used to quote special characters in a prefix or suffix |
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302 +----------+-----------------------------------------------------------------+
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303 | ``*`` | Pad escape, precedes pad character |
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304 +----------+-----------------------------------------------------------------+
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305
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306
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307 Parsing Numbers
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308 ---------------
32
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309
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310 Babel can also parse numeric data in a locale-sensitive manner::
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311
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312 >>> from babel.dates import parse_decimal, parse_number
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313
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314 Examples::
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315
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316 >>> parse_decimal('1,099.98', locale='en_US')
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317 1099.98
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318 >>> parse_decimal('1.099,98', locale='de')
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319 1099.98
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320 >>> parse_decimal('2,109,998', locale='de')
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321 Traceback (most recent call last):
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322 ...
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323 NumberFormatError: '2,109,998' is not a valid decimal number
Copyright (C) 2012-2017 Edgewall Software