python time.gmtime() 是否有反函数将 UTC 元组解析为自纪元以来的秒数？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/130074/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Is there an inverse function for time.gmtime() that parses a UTC tuple to seconds since the epoch?
提问by Thomas Vander Stichele
python's time module seems a little haphazard. For example, here is a list of methods in there, from the docstring:
python的时间模块似乎有点随意。例如，这里是文档字符串中的方法列表：
time() -- return current time in seconds since the Epoch as a float
clock() -- return CPU time since process start as a float
sleep() -- delay for a number of seconds given as a float
gmtime() -- convert seconds since Epoch to UTC tuple
localtime() -- convert seconds since Epoch to local time tuple
asctime() -- convert time tuple to string
ctime() -- convert time in seconds to string
mktime() -- convert local time tuple to seconds since Epoch
strftime() -- convert time tuple to string according to format specification
strptime() -- parse string to time tuple according to format specification
tzset() -- change the local timezone
Looking at localtime() and its inverse mktime(), why is there no inverse for gmtime() ?
查看 localtime() 及其逆 mktime()，为什么 gmtime() 没有逆？
Bonus questions: what would you name the method ? How would you implement it ?
额外的问题：你会给这个方法起什么名字？你将如何实施它？
回答by Tom
回答by Mark Roddy
I always thought the time and datetime modules were a little incoherent. Anyways, here's the inverse of mktime
我一直认为 time 和 datetime 模块有点不连贯。无论如何，这是 mktime 的倒数
import time
def mkgmtime(t):
"""Convert UTC tuple to seconds since Epoch"""
return time.mktime(t)-time.timezone
回答by Chris Jester-Young
I'm only a newbie to Python, but here's my approach.
我只是 Python 的新手，但这是我的方法。
def mkgmtime(fields):
now = int(time.time())
gmt = list(time.gmtime(now))
gmt[8] = time.localtime(now).tm_isdst
disp = now - time.mktime(tuple(gmt))
return disp + time.mktime(fields)
There, my proposed name for the function too. :-) It's important to recalculate dispevery time, in case the daylight-savings value changes or the like. (The conversion back to tuple is required for Jython. CPython doesn't seem to require it.)
在那里，我建议的函数名称也是如此。:-)disp每次重新计算都很重要，以防夏令时值发生变化等。（Jython 需要转换回元组。CPython 似乎不需要它。）
This is super ick, because time.gmtimesets the DST flag to false, always. I hate the code, though. There's got to be a better way to do it. And there are probably some corner cases that I haven't got, yet.
这time.gmtime太糟糕了，因为总是将 DST 标志设置为 false。不过，我讨厌代码。必须有更好的方法来做到这一点。可能还有一些我还没有得到的极端情况。
回答by Ilialuk
mktime documentation is a bit misleading here, there is no meaning saying it's calculated as a local time, rather it's calculating the seconds from Epoch according to the supplied tuple - regardless of your computer locality.
mktime 文档在这里有点误导，没有任何意义说它是按本地时间计算的，而是根据提供的元组计算 Epoch 的秒数 - 无论您的计算机位置如何。
If you do want to do a conversion from a utc_tuple to local time you can do the following:
如果您确实想将 utc_tuple 转换为本地时间，您可以执行以下操作：
>>> time.ctime(time.time())
'Fri Sep 13 12:40:08 2013'
>>> utc_tuple = time.gmtime()
>>> time.ctime(time.mktime(utc_tuple))
'Fri Sep 13 10:40:11 2013'
>>> time.ctime(time.mktime(utc_tuple) - time.timezone)
'Fri Sep 13 12:40:11 2013'
Perhaps a more accurate question would be how to convert a utc_tuple to a local_tuple.
I would call it gm_tuple_to_local_tuple(I prefer long and descriptive names):
也许更准确的问题是如何将 utc_tuple 转换为 local_tuple。我会称它为gm_tuple_to_local_tuple（我更喜欢长而描述性的名称）：
>>> time.localtime(time.mktime(utc_tuple) - time.timezone)
time.struct_time(tm_year=2013, tm_mon=9, tm_mday=13, tm_hour=12, tm_min=40, tm_sec=11, tm_wday=4, tm_yday=256, tm_isdst=1)
Validatation:
验证：
>>> time.ctime(time.mktime(time.localtime(time.mktime(utc_tuple) - time.timezone)))
'Fri Sep 13 12:40:11 2013'
Hope this helps, ilia.
希望这会有所帮助，ilia。
