为什么python的strptime不支持％z? [英] Why %z is not supported by python's strptime?

问题描述

>>> datetime.strptime('2014-02-13 11:55:00 -0800', '%Y-%m-%d %H:%M:%S %z')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/_strptime.py", line 317, in _strptime
    (bad_directive, format))
ValueError: 'z' is a bad directive in format '%Y-%m-%d %H:%M:%S %z'

我知道它不受支持，但不知道为什么.似乎并不难支持.而且，"与UTC的偏移量"不像时区缩写那样模棱两可.

I understand that it's not supported, but don't know why. Seems it's not hard to support that. And 'Offset from UTC' is not as ambiguous as timezone abbreviation.

推荐答案

直到Python 3.2，Python的 datetime 模块没有 timezone()对象.它通过提供 datetime.tzinfo来支持提供时区的第三方库.()抽象基类，但不包含时区对象.没有时区对象，也不支持解析时区偏移.

Until Python 3.2, Python's datetime module had no timezone() object. It supported 3rd-party libraries providing timezones by providing a datetime.tzinfo() abstract base class, but no timezone object was included. Without a timezone object, no support for parsing timezone offsets either.

从Python 3.2开始，支持 z ，因为该版本(及更高版本)添加了

As of Python 3.2, z is supported, because that version (and up) added a datetime.timezone() type:

>>> import datetime
>>> datetime.datetime.strptime('2014-02-13 11:55:00 -0800', '%Y-%m-%d %H:%M:%S %z')
datetime.datetime(2014, 2, 13, 11, 55, tzinfo=datetime.timezone(datetime.timedelta(-1, 57600)))
>>> _.tzinfo
datetime.timezone(datetime.timedelta(-1, 57600))

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