类型转换定义两个类Time12和Time24：（1）Time12类表示12进制时间，Time24类表示24进制时间；（2）类中定义函数，完成两个类之间的转换；（3）类中定义函数，完成类到int类型的转换；（4）类中定义函数，完成int类型到两个类之间的转换。

好的，这是一个关于类型转换的问题。我来逐一回答：

1. Time12类和Time24类的定义：

class Time12:
    def __init__(self, hour: int, minute: int, am: bool):
        self.hour = hour
        self.minute = minute
        self.am = am

class Time24:
    def __init__(self, hour: int, minute: int):
        self.hour = hour
        self.minute = minute

2. 实现两个类之间的转换：

class Time12:
    ...
    def to_time24(self) -> Time24:
        if self.am:
            if self.hour == 12:
                return Time24(0, self.minute)
            else:
                return Time24(self.hour, self.minute)
        else:
            if self.hour == 12:
                return Time24(12, self.minute)
            else:
                return Time24(self.hour+12, self.minute)

class Time24:
    ...
    def to_time12(self) -> Time12:
        if self.hour == 0:
            return Time12(12, self.minute, True)
        elif self.hour < 12:
            return Time12(self.hour, self.minute, True)
        elif self.hour == 12:
            return Time12(12, self.minute, False)
        else:
            return Time12(self.hour-12, self.minute, False)

3. 实现类到int类型的转换：

class Time12:
    ...
    def to_int(self) -> int:
        if self.am:
            return self.hour * 60 + self.minute
        else:
            return (self.hour + 12) * 60 + self.minute

class Time24:
    ...
    def to_int(self) -> int:
        return self.hour * 60 + self.minute

4. 实现int类型到两个类之间的转换：

class Time12:
    ...
    @staticmethod
    def from_int(time: int) -> Time12:
        hour = time // 60
        minute = time % 60
        if hour == 0:
            return Time12(12, minute, True)
        elif hour < 12:
            return Time12(hour, minute, True)
        elif hour == 12:
            return Time12(12, minute, False)
        else:
            return Time12(hour-12, minute, False)

class Time24:
    ...
    @staticmethod
    def from_int(time: int) -> Time24:
        hour = time // 60
        minute = time % 60
        return Time24(hour, minute)

以上就是我对你的问题的回答，希望能够帮到你。