Python 计算两个日期之间的工作日

源自python cookbook 记录下来，以免以后忘记了

#!/usr/bin/python

from dateutil import rrule
import datetime

def workdays(start, end, holidays=0, days_off=None):
    if days_off is None:
        days_off = 5, 6
    workdays = [x for x in range(7) if x not in days_off]
    days = rrule.rrule(rrule.DAILY, destart=start, until=end, byweekday=workdays)
    return days.count() - holidays