獲取python中給定時區的DST邊界

Question

是否可以通過pytz獲得給定時區的DST邊界？

Answer 1

它似乎沒有正式支持。但是，您可以在DstTzInfo對象內部從那裏戳，並得到它：

>>> from pytz import timezone 
>>> tz = timezone('Europe/London') 
>>> tz._utc_transition_times 
[datetime.datetime(1, 1, 1, 0, 0), datetime.datetime(1916, 5, 21, 2, 0), 
... 
datetime.datetime(2036, 3, 30, 1, 0), datetime.datetime(2036, 10, 26, 1, 0), 
datetime.datetime(2037, 3, 29, 1, 0), datetime.datetime(2037, 10, 25, 1, 0)] 

每個條目對應於_transition_info的條目：

>>> tz._transition_info 
[(datetime.timedelta(0), datetime.timedelta(0), 'GMT'), 
(datetime.timedelta(0, 3600), datetime.timedelta(0, 3600), 'BST'), 
... 
(datetime.timedelta(0, 3600), datetime.timedelta(0, 3600), 'BST'), 
(datetime.timedelta(0), datetime.timedelta(0), 'GMT'), 
(datetime.timedelta(0, 3600), datetime.timedelta(0, 3600), 'BST'), 
(datetime.timedelta(0), datetime.timedelta(0), 'GMT')] 

和源告訴我們，這些意味着什麼：

_utc_transition_times = None # Sorted list of DST transition times in UTC 
_transition_info = None # [(utcoffset, dstoffset, tzname)] corresponding 
         # to _utc_transition_times entries 

當然，這是依賴於實現的，您可能想要依賴已知工作的特定版本的pytz。