Python datetime strptime解析错误，为什么在'2008-10-26 01:00:00'和'2008-10-26 00:00:00'之间需要两个小时？

Question

I'm manipulating timedates and I've found something strange: I've just created a simple function to transform dates into datetimes (in seconds) and I've found this:

>>> import time
>>> from datetime import datetime
>>> parsefunc = lambda date : time.mktime(datetime.strptime(date, '%Y-%m-%d %H:%M:%S').timetuple())
>>> parsefunc('2008-10-25 01:00:00')-parsefunc('2008-10-25 00:00:00')
3600.0

All ok, there is 3600 s in one hour.

>>> parsefunc('2008-10-26 01:00:00')-parsefunc('2008-10-26 00:00:00')
7200.0

But here there is 7200 s of difference.

Does anyone know what is happening? Is any library deprecated? I've found some other dates when there is the same problem: '2009-10-25 00:00:00', '2010-10-31 00:00:00', '2011-10-30 00:00:00', '2012-10-28 00:00:00', '2013-10-27 00:00:00', '2014-10-26 00:00:00', '2015-10-25 00:00:00', '2016-10-30 00:00:00', '2017-10-29 00:00:00' and '2018-10-28 00:00:00'

Thanks in advance, I can avoid this problem but I'm curious why is this happening.

Answer 1

好的，我刚刚发现了为什么会这样，这只是时间的变化:)