获取指定日期前几天

import datetime


def get_other_day(mytime, n):
    y, m, d = mytime.split("-")
    theday = datetime.datetime(int(y), int(m), int(d))
    delta = datetime.timedelta(days=n)
    other_day = theday - delta
    other_day = other_day.strftime('%Y-%m-%d')
    return other_day


other_day = get_other_day("2020-2-25", 2)
print(other_day)