为什么相同的内容类型的字符串不相等?
start_time = '2022/1/1'
time1 = 7
tm = '20211225'
mydate1 = datetime.datetime.strptime(start_time, '%Y/%m/%d')
start_date = ((str(mydate1 - datetime.timedelta(days=time1)))[0:-8]).replace('-','')
end_date = ((str(mydate1 + datetime.timedelta(days=time1)))[0:-8]).replace('-','')
print(start_date,end_date)
print(start_date == tm)