Python – Berechnen Sie das Datum der letzten Woche 5

第一种方法:

Python代码  

from datetime Thursday',  

            'Friday','Saturday','Sunday']  

def get_ previous_byday(dayname, start_date=None):  

    wenn start_date None ist:  

start_date = datetime.today ()

Day_num = start_date.weekday ()

Day_num_target = wochentage - day_num_target) % 7  

    if days_ago == 0:  

        days_ago = 7  

    target_date = start_date - timedelta(days = days_ago)  

    Rückgabezieldatum

  

print( datetime.today() )  

print( get_ previous_byday('Monday') )  

print( get_ previous_byday('Monday', datetime (2016, 8, 28)) )  

 第二种方法，用dateutil模块

Python代码  

from datetime import datetime  

from dateutil. relativedelta import relativedelta  

from dateutil.rrule import *  

d = datetime.now()  

print(d)  

print(d + relativedelta( Wochentag=FR))  

print(d + relativedelta(Wochentag=FR(-1)))