2024/11/11

class Cexception(Exception):
    """自定义异常处理类"""

    def __init__(self, msg):
        self.msg = msg


class Date:
    """日期类"""

    def __init__(self, year, month, day):
        """有参构造函数，初始化年、月、日"""
        try:
            if not self._is_valid_date(year, month, day):
                raise Cexception("Invalid date!")
            self.year = year
            self.month = month
            self.day = day
        except Cexception as e:
            print("Error:", e.msg)

    def set_date(self, year, month, day):
        """设置日期"""
        try:
            if not self._is_valid_date(year, month, day):
                raise Cexception("Invalid date!")
            self.year = year
            self.month = month
            self.day = day
        except Cexception as e:
            print("Error:", e.msg)

    def display_date(self):
        """以格式 '月/日/年' 输出日期"""
        print(f"{self.month}/{self.day}/{self.year}")

    def _is_valid_date(self, year, month, day):
        """检查日期是否合法"""
        if year < 1 or month < 1 or month > 12 or day < 1:
            return False
        if month == 2:
            if (year % 4 == 0 and year % 100 != 0) or year % 400 == 0:
                return day <= 29
            else:
                return day <= 28
        if month in {4, 6, 9, 11}:
            return day <= 30
        return day <= 31


# 测试日期类
if __name__ == "__main__":
    # 创建日期对象并设置日期
    date1 = Date(2024, 5, 9)
    date1.display_date()  # 输出：5/9/2024

    # 设置无效日期，触发异常处理
    date2 = Date(2024, 13, 35)  # 输出：Error: Invalid date!

    # 设置有效日期
    date1.set_date(2024, 2, 29)
    date1.display_date()  # 输出：2/29/2024

    # 设置无效日期，触发异常处理
    date1.set_date(2023, 2, 29)  # 输出：Error: Invalid date!