计算日期是当年第几天（要考虑闰年）

[python]代码库

def is_leap_year(year):
    """判断是否为闰年"""
    if year % 4 == 0:
        if year % 100 == 0:
            if year % 400 == 0:
                return True
            else:
                return False
        else:
            return True
    else:
        return False

def day_of_year(year, month, day):
    """计算日期是该年份的第几天"""
    days_in_month = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    if is_leap_year(year):
        days_in_month[1] = 29

    total_days = sum(days_in_month[:month - 1]) + day
    return total_days

# 输入年月日
year = int(input("请输入年份："))
month = int(input("请输入月份："))
day = int(input("请输入日期："))

# 判断是否为闰年
leap_year = is_leap_year(year)
if leap_year:
    print(f"{year}年是闰年")
else:
    print(f"{year}年不是闰年")

# 计算日期是该年份的第几天
day_of_year = day_of_year(year, month, day)
print(f"{year}年的第{day_of_year}天")

[代码运行效果截图]