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

"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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1 '''
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2 This module provides some datetime.tzinfo implementations.
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3
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4 All those classes are taken from the Python documentation.
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5 '''
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6 from datetime import timedelta, tzinfo
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7 import time
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8
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9 ZERO = timedelta(0)
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10 # constant for zero time offset.
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11
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12
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13 class Utc(tzinfo):
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14 '''UTC
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15
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16 Universal time coordinated time zone.
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17 '''
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18
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19 def utcoffset(self, dt):
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20 '''
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21 Return offset from UTC in minutes east of UTC, which is ZERO for UTC.
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22 '''
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23 return ZERO
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24
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25 def tzname(self, dt):
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26 '''
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27 Return the time zone name corresponding to the datetime object dt,
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28 as a string.
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29 '''
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30 return "UTC"
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31
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32 def dst(self, dt):
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33 '''
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34 Return the daylight saving time (DST) adjustment, in minutes east
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35 of UTC.
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36 '''
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37 return ZERO
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38
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39 def __reduce__(self):
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40 '''
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41 When unpickling a Utc object, return the default instance below, UTC.
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42 '''
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43 return _Utc, ()
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44
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45
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46 UTC = Utc()
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47 # the default instance for UTC.
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48
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49
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50 def _Utc():
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51 '''
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52 Helper function for unpickling a Utc object.
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53 '''
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54 return UTC
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55
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56
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57 class FixedOffset(tzinfo):
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58 '''
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59 A class building tzinfo objects for fixed-offset time zones.
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60
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61 Note that FixedOffset(0, 0, "UTC") or FixedOffset() is a different way to
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62 build a UTC tzinfo object.
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63 '''
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64
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65 def __init__(self, offset_hours=0, offset_minutes=0, name="UTC"):
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66 '''
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67 Initialise an instance with time offset and name.
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68 The time offset should be positive for time zones east of UTC
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69 and negate for time zones west of UTC.
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70 '''
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71 self.__offset = timedelta(hours=offset_hours, minutes=offset_minutes)
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72 self.__name = name
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73
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74 def utcoffset(self, dt):
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75 '''
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76 Return offset from UTC in minutes of UTC.
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77 '''
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78 return self.__offset
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79
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80 def tzname(self, dt):
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81 '''
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82 Return the time zone name corresponding to the datetime object dt, as a
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83 string.
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84 '''
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85 return self.__name
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86
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87 def dst(self, dt):
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88 '''
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89 Return the daylight saving time (DST) adjustment, in minutes east of
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90 UTC.
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91 '''
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92 return ZERO
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93
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94 def __repr__(self):
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95 '''
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96 Return nicely formatted repr string.
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97 '''
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98 return "<FixedOffset %r>" % self.__name
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99
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100
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101 STDOFFSET = timedelta(seconds=-time.timezone)
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102 # locale time zone offset
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103
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104 # calculate local daylight saving offset if any.
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105 if time.daylight:
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106 DSTOFFSET = timedelta(seconds=-time.altzone)
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107 else:
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108 DSTOFFSET = STDOFFSET
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109
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110 DSTDIFF = DSTOFFSET - STDOFFSET
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111 # difference between local time zone and local DST time zone
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112
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113
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114 class LocalTimezone(tzinfo):
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115 """
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116 A class capturing the platform's idea of local time.
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117 """
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118
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119 def utcoffset(self, dt):
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120 '''
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121 Return offset from UTC in minutes of UTC.
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122 '''
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123 if self._isdst(dt):
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124 return DSTOFFSET
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125 else:
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126 return STDOFFSET
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127
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128 def dst(self, dt):
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129 '''
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130 Return daylight saving offset.
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131 '''
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132 if self._isdst(dt):
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133 return DSTDIFF
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134 else:
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135 return ZERO
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136
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137 def tzname(self, dt):
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138 '''
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139 Return the time zone name corresponding to the datetime object dt, as a
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140 string.
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141 '''
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142 return time.tzname[self._isdst(dt)]
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143
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144 def _isdst(self, dt):
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145 '''
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146 Returns true if DST is active for given datetime object dt.
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147 '''
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148 tt = (dt.year, dt.month, dt.day,
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149 dt.hour, dt.minute, dt.second,
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150 dt.weekday(), 0, -1)
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151 stamp = time.mktime(tt)
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152 tt = time.localtime(stamp)
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153 return tt.tm_isdst > 0
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154
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155
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156 # the default instance for local time zone.
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157 LOCAL = LocalTimezone()