calendar库

import calendar

str = (input("请输入一个年-月："))
if len(str) != 7:
    print("请重新输入年月格式如：2022-11")
else:

    list = str.split('-')
    Years = int(list[0])
    month = int(list[1])
    # print( Years,month,list)
    monthRange = calendar.monthrange(Years, month)
    print(monthRange)
    if 0 < month < 4:
        print(month, "月属于第1季度")
    elif 3 < month < 7:
        print(month, "月属于第2季度")
    elif 6 < month < 10:
        print(month, "月属于第3季度")
    elif 9 < month < 13:
        print(month, "月属于第4季度")
    print("%d年%d月有%d天" % (Years, month, monthRange[1]))

monthRange，输入年份和月份，输出：当月第一天星期几，当月有多少天