python练习题（一）：输入某年某月某日，判断这一天是这一年的第几天

python练习题（一）：输入某年某月某日，判断这一天是这一年的第几天

# 题目：输入某年某月某日，判断这一天是这一年的第几天？

year = int(input("年："))
while True:
    month = int(input("月："))
    if 1 <= month <= 12:
        while True:
            day = int(input("日："))
            days = 0
            months_1 = [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
            months_2 = [0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
            if (year % 400 == 0) or (year % 4 == 0 and year % 100 != 0):
                if 1 <= day <= months_2[month]:
                    for i in range(month):
                        days += months_2[i]
                    days += day
                    print("%d年%d月%d日 是%d年的第%d天" % (year, month, day, year, days))
                    break
                else:
                    print("请输入正确的日期！")
            else:
                if 1 <= day <= months_1[month]:
                    for i in range(month):
                        days += months_1[i]
                    days += day
                    print("%d年%d月%d日 是%d年的第%d天" % (year, month, day, year, days))
                    break
                else:
                    print("请输入正确的日期！")
        break
    else:
        print("请输入正确的月份！")

程序运行结果：