PythonNote016---求某个日期是当年的第几周，当周的第几天

import time
from datetime import datetime
data_day = '20190101'
week = int(datetime.strptime(data_day,"%Y%m%d").strftime("%W"))+1
weekday = '7' if datetime.strptime(data_day,"%Y%m%d").strftime("%w")=='0' else datetime.strptime(data_day,"%Y%m%d").strftime("%w")
print('第'+str(week)+'周 ;'+'当周第'+weekday+'天')

注意：第一周，python计为00周。每周的周日记为0