Enter a certain month of a certain year to determine how many days there are in this month

Requirement: Enter a certain month of a certain year to determine how many days there are in this month

Analysis:
1, 3, 5, 7, 8, 10, 12: 31 days 4, 6, 9, 11
: 30 days
2: leap year: 29 days, normal year: 28 days Core: determine whether
the input year is a leap year or a normal year
1: Year %400 == 0 leap year 2000
Case 2: Year %4 == 0 and year %100 != 0 1900 is not a leap year

code:

'''方法一'''
if __name__ == '__main__':
    year = int(input('请输入年份：'))
    month = int(input('请输入月份：'))
    # 判断
    if month in [1, 3, 5, 7, 8, 10, 12]:
        days = 31
    elif month in [4, 6, 9, 11]:
        days = 30
    else:
        # 处理2月份
        if year % 400 == 0 or (year % 4 == 0 and year % 100 != 0):
            days = 29
        else:
            days = 28
    # 输出
    print('%d年%d月：%d天' % (year, month, days))

'''方法二'''
year = int(input('请输入年份：'))
    month = int(input('请输入月份：'))
    # 定义一个list
    days_list = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    # 判断是否是闰年
    if (month == 2) and (year % 400 == 0 or (year % 4 == 0 and year % 100 != 0)):
        print('%d年%d月：%d天' % (year, month, days_list[month - 1] + 1))
    else:
        print('%d年%d月：%d天' % (year, month, days_list[month - 1]))