python－計算上週5的日期

第一個方法：

Python代碼  

from datetime import datetime, timedelta  

weekdays = [    '星期五','星期六', '星期日']  

def get_previous_byday(dayname, start_date=None):  

    如果start_date 為None: 

    day_num = start_date.weekday()  

    day_num_target = weekdays.index(dayname )

    days_ago = (7 + day_num - day_num_target) % 7  

ago = 7  

    target_date = start_date - timedelta(day s = days_ago)  

datetime. Today() )  

print( get_previous_byday('Monday') )  

print( get_previous_byday('Monday', datetime(2016, get), il模組

Python程式碼  

from datetime 導入datetime

from dateutil.relativedelta 導入relativedelta

from dateutil.rrule=print* print(d + +relativedelta(weekday=FR ))  

print(d +relativedelta(工作日=FR(-1)))