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112 判断月有几天

import calendar
from datetime import date

mydate = date.today()
weekday, days = calendar.monthrange(mydate.year, mydate.month)
print(f'{mydate.year}年-{mydate.month}月的第一天是那一周的第{weekday}\n')
print(f'{mydate.year}年-{mydate.month}月共有{days}\n')

打印结果:

2019-12月的第一天是那一周的第6天

2019-12月共有31天