[python] 計算日期 min , Max 和求 日期差距（含假日）, check the date is what day of the week (or weekend)

from datetime import *

    # create a date( ) list
    datetime_list=[date(2016,6,30),date(2016,6,31).............]


    print(min(datetime_list),max(datetime_list))

    delta_days=max(datetime_list)-min(datetime_list)
    print(delta_days.days)

    delta_days=date(2016,3,28)-date(2016,3,21)
    print(delta_days.days)


#------------- check the date is what day of the week-----------------------------------------
    dt=date(2016,3,20)       
    if dt.isoweekday()==6 or dt.isoweekday()==7:
                print('do someting')
              



detail:   https://docs.python.org/2/library/datetime.html