import datetime
print(datetime.date.today()-datetime.timedelta(days=datetime.date.today().weekday()))

获取本周星期二

import datetime
print(datetime.date.today()-datetime.timedelta(days=datetime.date.today().weekday()-1))

获取本周星期三

import datetime
print(datetime.date.today()-datetime.timedelta(days=datetime.date.today().weekday()-2))

后面以此类推

俗人昭昭,我独昏昏。俗人察察,我独闷闷。