日期图书馆,能计算“每三个星期二”之类的东西吗?

总有 dateutil .
下面的示例基于 ~unutbu 的 excellent answer 到 this very similar SO question :

>>> from datetime import date
>>> from dateutil import rrule, relativedelta
>>> every_third_tuesday = rrule.rrule(rrule.MONTHLY, 
                                      byweekday=relativedelta.TU(3), 
                                      dtstart=date.today(), 
                                      count=3)
>>> for tt in every_third_tuesday:
...   print tt.date()
... 
2010-07-20
2010-08-17
2010-09-21

试试 calendar 模块。这是一篇很好的文章——这是你要求的内容的一部分: http://www.doughellmann.com/PyMOTW/calendar/index.html