Python 输入年月求天数

year = int(input("请输入年份"))  # 输入整型数
month = int(input("请输入月份"))

day = -1
if month >= 1 and month <= 12: # 月份在1~12
    if month in (1,3,5,7,8,10,12): # 大月
        day = 31
    elif month in (4,6,9,11):  # 小月
        day = 30
    else:
        # 以下两种情况之一都可以判断是闰年
        if year % 400 == 0 or (year % 4 == 0 and year % 100 != 0):
            day = 29
        else:
            day = 28
    print("%d年%d月有%d天" % (year, month, day))
else:
    print("月份输入有误！")