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小白学python第73天之Python中的继承(下)

  • 2026-02-25 10:40:54
小白学python第73天之Python中的继承(下)

2.18

Python中的继承(下)

?

学前疑问

如果你需要设计一个“水陆两栖机器人”,它既要能在陆地上移动,又要能在水中巡游,你会如何设计它的代码结构?是选择写一个庞大而复杂的类,还是有更优雅的方式让它同时拥有“车”和“船”的特性?

1

Python中的继承(下)

(1)多继承

什么是多继承?

Python语言是少数支持多继承的一门编程语言,所谓的多继承就是允许一个类同时继承自多个类的特性。

基本语法:

class B(object):    passclass C(object):    passclass A(B, C):    passa = A()a.B中的所有属性和方法a.C中的所有属性和方法

案例:

汽油车、电动车 => 混合动力汽车(汽车 + 电动)

class GasolineCar(object):    def run_with_gasoline(self):        print('i can run with gasoline')class EletricCar(object):    def run_with_eletric(self):        print('i can run with eletric')class HybridCar(GasolineCarEletricCar):    passtesla = HybridCar()tesla.run_with_gasoline()tesla.run_with_eletric()

注意:虽然多继承允许我们同时继承自多个类,但是实际开发中,应尽量避免使用多继承,因为如果两个类中出现了相同的属性和方法就会产生命名冲突。

(2)子类扩展:重写父类属性和方法

扩展特性:继承让子类继承父类的所有公共属性和方法,但是如果仅仅是为了继承公共属性和方法,继承就没有实际的意义了,应该是在继承以后,子类应该有一些自己的属性和方法。

什么是重写?

重写也叫作覆盖,就是当子类成员与父类成员名字相同的时候,从父类继承下来的成员会重新定义!

此时,通过子类实例化出来的对象访问相关成员的时候,真正其作用的是子类中定义的成员!

上面单继承例子中 Animal 的子类 Cat和Dog 继承了父类的属性和方法,但是我们狗类Dog 有自己的叫声'汪汪叫',猫类 Cat 有自己的叫声 '喵喵叫' ,这时我们需要对父类的 call() 方法进行重构。如下:

class Animal(object):    def eat(self):        print('i can eat')    def call(self):        print('i can call')class Dog(Animal):    passclass Cat(Animal):    passwangcai = Dog()wangcai.eat()wangcai.call()miaomiao = Cat()miaomiao.eat()miaomiao.call()

Dog、Cat子类重写父类Animal中的call方法:

class Animal(object):    def eat(self):        print('i can eat')    def call(self):        print('i can call')class Dog(Animal):    # 重写父类的call方法    def call(self):        print('i can wang wang wang')class Cat(Animal):    # 重写父类的call方法    def call(self):        print('i can miao miao miao')wangcai = Dog()wangcai.eat()wangcai.call()miaomiao = Cat()miaomiao.eat()miaomiao.call()

思考:重写父类中的call方法以后,此时父类中的call方法还在不在?

答:还在,只不过是在其子类中找不到了。类方法的调用顺序,当我们在子类中重构父类的方法后,Cat子类的实例先会在自己的类 Cat 中查找该方法,当找不到该方法时才会去父类 Animal 中查找对应的方法。

(3)super()调用父类属性和方法

super():调用父类属性或方法,完整写法:super(当前类名, self).属性或方法(),在Python3以后版本中,调用父类的属性和方法我们只需要使用super().属性super().方法名()就可以完成调用了。

案例:

Car汽车类、GasolineCar汽油车、ElectricCar电动车

class Car(object):    def __init__(self, brand, model, color):        self.brand = brand        self.model = model        self.color = color     def run(self):        print('i can run')class GasolineCar(Car):    def __init__(self, brand, model, color):        super().__init__(brand, model, color)    def run(self):        print('i can run with gasoline')class ElectricCar(Car):    def __init__(self, brand, model, color):        super().__init__(brand, model, color)        # 电池属性        self.battery = 70    def run(self):        print(f'i can run with electric,remain:{self.battery}')bwm = GasolineCar('宝马''X5''白色')bwm.run()tesla = ElectricCar('特斯拉''Model S''红色')tesla.run()

今日学习完毕,课后作业: 

多继承的方法调用顺序,题目要求:

① 创建两个父类 Teacher和 Student,每个类中定义一个同名方法 introduce(),但实现不同:

Teacher的 introduce()返回 "我是一名老师"。

Student的 introduce()返回 "我是一名学生"。

② 创建一个子类 TeachingAssistant,同时继承 Teacher和 Student(顺序为先 Teacher后 Student)。

③ 在子类中不重写 introduce()方法。

④ 实例化 TeachingAssistant类,调用其 introduce()方法,观察输出并解释原因。

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  1. CONNECT:[ UseTime:0.000366s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000606s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000284s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000250s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000481s ]
  6. SELECT * FROM `set` [ RunTime:0.000202s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000503s ]
  8. SELECT * FROM `article` WHERE `id` = 476050 LIMIT 1 [ RunTime:0.000408s ]
  9. UPDATE `article` SET `lasttime` = 1772292458 WHERE `id` = 476050 [ RunTime:0.000728s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000214s ]
  11. SELECT * FROM `article` WHERE `id` < 476050 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000457s ]
  12. SELECT * FROM `article` WHERE `id` > 476050 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000461s ]
  13. SELECT * FROM `article` WHERE `id` < 476050 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001739s ]
  14. SELECT * FROM `article` WHERE `id` < 476050 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000888s ]
  15. SELECT * FROM `article` WHERE `id` < 476050 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000713s ]
0.073845s