问题
I need to parse a crontab-like schedule definition in Python (e.g. 00 3 * * *) and get where this should have last run.
Is there a good (preferably small) library that parses these strings and translates them to dates?
回答1:
Perhaps the python package croniter suits your needs.
Usage example:
>>> import croniter
>>> import datetime
>>> now = datetime.datetime.now()
>>> cron = croniter.croniter('45 17 */2 * *', now)
>>> cron.get_next(datetime.datetime)
datetime.datetime(2011, 9, 14, 17, 45)
>>> cron.get_next(datetime.datetime)
datetime.datetime(2011, 9, 16, 17, 45)
>>> cron.get_next(datetime.datetime)
datetime.datetime(2011, 9, 18, 17, 45)
回答2:
Maybe you can use this module:
http://code.activestate.com/recipes/577466-cron-like-triggers/
I used that module for making an user-space cron in Python and it works very well. This module can handle crontab-like lines.
来源：https://stackoverflow.com/questions/7390170/parsing-crontab-style-lines