python 类组合

场景：有一辆车违章需要通知到车主

定义两个类车辆类和通知类，车辆类和通知类并没有共同点，但是要通知车主这两个类就有了关联，这时候可以把这两个类组合在一起

#!/usr/bin/python3
# -*- coding: utf-8 -*-

class Car:
    """车辆类"""

    def __init__(self, car_type, car_number):
        self.car_type = car_type
        self.car_number = car_number

    def type_info(self):
        return self.car_type

    def number_info(self):
        return self.car_number

class Notice:
    """通知类"""
    def __init__(self, addr, message, car_info):
        self.addr = addr
        self.message = message
        self.car = car_info

    def message_sms(self):
        print(self.car.number_info() + self.car.type_info() + "在" + self.addr + self.message)

car = Car("小客车", "浙A99999")
notice = Notice("杭州文一路", "不按规定停车", car)

notice.message_sms()

>>>浙A99999小客车在杭州文一路不按规定停车