问题
I find myself needing to specify a timespan in a python configuration file a lot.
Is there a way that I can specify a more human readable timeframe (similar to PostgreSQL's Interval syntax) in a python configuration file with stdlib? Or will this require a 3rd party lib?
Clarification I'm not looking for anything in the ConfigParser.ConfigParser stdlib API specifically. I guess what I really need is a way to go from human readable date/time interval to datetime.timedelta value.
回答1:
I don't think there is a standard library module for that. I wrote one that does that. You can install it, or adapt it to your needs.
The module is called pycopia.timespec
It converts strings such as "1day 3min" to seconds, as a float. It's easy to get a datetime.timedelta from that.
回答2:
I found a good answer to this in an somewhat related question. Turns out the humanfriendly library does that fairly well:
In [1]: import humanfriendly
In [2]: humanfriendly.parse_timespan('1w')
Out[2]: 604800.0
That's in seconds. To get a timedelta object, you can simply load that:
In [3]: from datetime import timedelta
In [4]: timedelta(seconds=humanfriendly.parse_timespan('1w'))
Out[4]: datetime.timedelta(7)
Since humanfriendly also supports converting the other way, you can also do full round trip, which would look like:
In [5]: humanfriendly.format_timespan(timedelta(seconds=humanfriendly.parse_timespan('1w')).total_seconds())
Out[5]: '1 week'
Note how format_timespan does not access timedelta objects, unfortunately: only an integer (seconds).
来源：https://stackoverflow.com/questions/13958844/human-readable-datetime-interval-to-datetime-timedelta-in-python