查找上一个/上周的星期五在python [英] Find the Friday of previous/last week in python

问题描述

例如：假设我有一天4/30/07。然后我需要得到4/27/07。

Eg2。假设我有一天6/29/07。然后我需要得到6/22/07。

解决方案

假设 day 是一个 datetime.date 或 datetime.datetime 对象，这个代码为上周星期五创建一个 datetime / date 对象：

  friday = day  -  timedelta（days = day.weekday（））+ timedelta（days = 4，weeks = -1）
  / pre> 
 
 
说明： timedelta（days = day.weekday（））是星期一与 day 所以添加4天，减去一周会让你上周的星期五。
 
 
 
当然可以简化这个（ + 4d -1w = -3d ）：
  friday = day  -  timedelta （days = day.weekday（）+ 3）
  
注意：要获取 timedelta ，使用datetime import timedelta 中的或只需 import datetime 并使用 datetime.timedelta  
 
Eg1. Suppose I have a day 4/30/07 .Then I need to get 4/27/07. 

Eg2. Suppose I have a day 6/29/07 .Then I need to get 6/22/07.
解决方案
Assuming day is a datetime.date or datetime.datetime object, this code creates a datetime/date object for last week's friday:
friday = day - timedelta(days=day.weekday()) + timedelta(days=4, weeks=-1)
Explanation: timedelta(days=day.weekday()) is the offset between monday and day so adding 4 days and subtracting one week will get you last week's friday.

Of course you can simplify this (+4d -1w = -3d):
friday = day - timedelta(days=day.weekday() + 3)
Note: To get timedelta, use from datetime import timedelta or just import datetime and use datetime.timedelta

                        
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