Mercurial > repos > shellac > guppy_basecaller
annotate env/lib/python3.7/site-packages/isodate/tzinfo.py @ 0:26e78fe6e8c4 draft
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author | shellac |
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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() |