python - 解决 time.strptime(today.strftime ("%x"), "%x") 在某些地区失败

Question

尝试在文本图形用户界面小部件中显示本地化日期字符串。我目前采用的方法是将带有 datetime.datetime.strftime("%x") 的本地化字符串显示到文本小部件中，以便用户可以对其进行编辑。然后我尝试用 time.strptime("x") 解析字符串。

目前的问题是对于某些地区(or_IN, ja_JP.UTF-8, ko_KO.UTF-8)time.strptime("x") 无法解析datetime.datetime.strftime("% X”)。 它总是抛出一个 ValueError 试图解析它。

我怀疑这是在日期格式中使用双字节分隔符的 strptime 和日期字符串的问题。这也可能是 %x 对 strftime 和 strptime 的意义不同的问题(如果我理解正确，一个基本上只是 glibc 实现，而另一个是特定于 python 的)。

我正在寻找一种更好的方法来处理本地化的日期字符串，以便可以在用户界面中对其进行编辑。

#!/usr/bin/python


# We are trying to present a localized date in a text widget, so
# that a user could potentially edit it, and then we try to
# parse it with datetime.strptime

# however, even if the user doesn't edit the date produced
# by today.strftime("%x"), time.strptime(DATE, "%x") fails
# to parse it

# Not sure what's going on there before. I've seen this once
# before with in_OR, and that turned out to be a locale bug
# in glibc. This could also be the case, so what I'm looking
# for is a more robust approach to this problem that will
# work on all locales

# platform: fedora 14, x86_64
# Python 2.7 (r27:82500, Sep 16 2010, 18:02:00) 
# [GCC 4.5.1 20100907 (Red Hat 4.5.1-3)] on linux2

import datetime
import time
import locale

today = datetime.date.today()

# works for "C"
locale.setlocale(locale.LC_ALL, 'C')
print time.strptime(today.strftime("%x"), "%x")

# works for en_us.utf8
locale.setlocale(locale.LC_ALL, 'en_US.utf8')
print time.strptime(today.strftime("%x"), "%x")


# fails for 'ja_JP.UTF-8'
loc = 'ja_JP.UTF-8'
locale.setlocale(locale.LC_ALL,loc)
try:
    print today.strftime("%x")
    print time.strptime(today.strftime("%x"), "%x")
except ValueError:
    print "failed for %s" % loc


loc = 'ko_KR.UTF-8'
locale.setlocale(locale.LC_ALL,loc)
try:
    print today.strftime("%x")
    print time.strptime(today.strftime("%x"), "%x")
except ValueError:
    print "failed for %s" % loc

以及此测试程序在我的系统(fedora 14、x86_64)上的示例输出:

time.struct_time(tm_year=2011, tm_mon=10, tm_mday=10, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=0, tm_yday=283, tm_isdst=-1)
time.struct_time(tm_year=2011, tm_mon=10, tm_mday=10, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=0, tm_yday=283, tm_isdst=-1)
2011年10月10日
failed for ja_JP.UTF-8
2011년 10월 10일
failed for ko_KR.UTF-8

Answer 1

检查locale_alias字典中是否有您的语言环境

>>> import locale
>>> len(locale.locale_alias)
843
>>> locale.locale_alias.keys()[:10]
['ko_kr.euc', 'is_is', 'ja_jp.mscode', 'kw_gb@euro', 'yi_us.cp1255', 'ca_es@euro', 'ja_jp.ujis', 'ar_ma', 'greek.iso88597', 'sr_yu.iso88592']
>>>