How to use the inheritance of Python

This article introduces the relevant knowledge of "how to use the inheritance of Python". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Three major object-oriented features:

To encapsulate properties and methods into an abstract class according to their responsibilities.

Inheritance to achieve the reuse of code, the same code does not need to be written repeatedly

Polymorphic different objects call the same method, resulting in different execution results and increasing the flexibility of the code.

1. Single inheritance 1.1 the concept, syntax and characteristics of inheritance

The concept of inheritance: subclasses have all the methods and properties of the parent class

Do not use inherited classes

Class Animal: def eat (self): print (eat) def drink (self): print (drink) def run (self): print (run) def sleep (self): print (sleep) class Dog: def eat (self): print (eat) def drink (self): print (drink) def run (self): print (run ) def sleep (self): print ("sleep") def bark (self): print ("bark") # create an object-dog object wangcai = Dog () wangcai.eat () wangcai.drink () wangcai.run () wangcai.bark () 1), Inherited syntax class class name (parent class name): pass

The subclass inherits from the parent class and can directly enjoy the encapsulated methods in the parent class without the need to develop again

Subclasses should encapsulate properties and methods specific to subclasses according to their responsibilities

Use inherited classes:

Class Animal: def eat (self): print ("eat -") def drink (self): print ("drink--") def run (self): print ("run -") def sleep (self): print ("sleep -") class Dog (Animal): # subclass has all the properties and methods of the parent class # def eat (self): # print (" Eat) # # def drink (self): # print (drink) # # def run (self): # print ("run") # # def sleep (self): # print ("sleep") def bark (self): print ("bark") # create an object-dog object wangcai = Dog () wangcai.eat () wangcai.drink ( Wangcai.run () wangcai.sleep () wangcai.bark () 2), Professional terminology

The Dog class is a subclass of the Animal class, the Animal class is the parent of the Dog class, and the Dog class inherits from the Animal class

Dog class is a derivative of the Animal class, the Animal class is the base class of the Dog class, and the Dog class is derived from the Animal class

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