需求背景：数据当周出不完装的情况下，都会去取上周数据，也就是完全不在更新的数据（适用于间隔时间段的数据）
例如：当天数是2021-11-04 我们会去取2021-10-24(上上周六) 至2021-10-30(上周日) 之间的数据，
在本周，也就是 2021-11-01至2021-11-07(一周七天) ，不管任何一天都要取2021-10-24(上上周六) 至2021-10-30(上周日) 之间的数据。

1.当天日期我们根据datetime模块来取

import datetime
datetime.datetime.today()
2.当天日期和我们要得到的日期之间的差值 我们使用timedelta模块
from datetime import timedelta
3.综合代码如下：
# -*- coding: utf-8 -*-
import datetime
from datetime import timedelta
#根据当前日期获取 上上周日 到 上周六 的日期值
class ActiveLastWeek:
    def __init__(self):
    def get_week_day(self,date_s):
        week_day_dict = {
        0 : '1',
        1 : '2',
        2 : '3',
        3 : '4',
        4 : '5',
        5 : '6',
        6 : '7',
        day = date_s.weekday()
        return week_day_dict[day]
    def active_date(self,choice_date):
        last_last_sunday = ''
        last_saturday = ''
        # choice_date = datetime.datetime.today()
        week = self.get_week_day(choice_date)
        if week == '1':
            print('周一')
            last_saturday = choice_date - timedelta(days=2)
            last_last_sunday = choice_date - timedelta(days=8)
        if week == '2':
            print('周二')
            last_saturday = choice_date - timedelta(days=3)
            last_last_sunday = choice_date - timedelta(days=9)
        elif week == '3':
            print('周三')
            last_saturday = choice_date - timedelta(days=4)
            last_last_sunday = choice_date - timedelta(days=10)
        elif week == '4':
            print('周四')
            last_saturday = choice_date - timedelta(days=5)
            last_last_sunday = choice_date - timedelta(days=11)
        elif week == '5':
            print('周五')
            last_saturday = choice_date - timedelta(days=6)
            last_last_sunday = choice_date - timedelta(days=12)
        elif week == '6':
            print('周六')
            last_saturday = choice_date - timedelta(days=7)
            last_last_sunday = choice_date - timedelta(days=13)
        elif week == '7':
            print('周日')
            last_saturday = choice_date - timedelta(days=8)
            last_last_sunday = choice_date - timedelta(days=14)
        now_date = choice_date.date()
        from_date = last_last_sunday.date()
        to_date = last_saturday.date()
        # print(now_date,from_date,to_date)
        print('当天：{0}'.format(now_date))
        print('上上周六：{0}'.format(from_date))
        print('上周日：{0}'.format(to_date))
if __name__ == '__main__':
    t = ActiveLastWeek()
    t.active_date(datetime.datetime.today())
4.运行结果如下