Pythons three object-oriented features: encapsulation, inheritance, and polymorphism

Python It is an object-oriented language . Object oriented has three major features ： encapsulation 、 Inherit 、 polymorphic .

Let's talk about these three characteristics :

Hide object properties and implementation details , Only public access is provided . stay python Set the property to private by starting with a double underscore .

benefits ：

1. Isolate change ;

2. Easy to use ;

3. Improve reusability ;

4. Improve safety .

Inheritance is a way to create new classes , stay python in , The new class can inherit one or more parent classes , A parent class can also be called a base class or a superclass , The new class is called a derived class or subclass .

That is, a derived class inherits the fields and methods of the base class . Inheritance also allows the object of a derived class to be treated as a base class object .

for example , There is such a design ： One Dog Object of type derived from Animal class , This is a simulation " It's a （is-a）" Relationship .

python The inheritance of classes in is divided into ： Single inheritance and multiple inheritance

Many forms of a thing , Function rewriting is actually an embodiment of polymorphism .Python in , Polymorphism means that the reference of the parent class points to the object of the child class .

Steps to achieve polymorphism ：

1、 Define new subclasses

2、 Override the corresponding parent class method

3、 Use subclass methods to deal with , Don't call methods of the parent class

The benefits of polymorphism ：

（1） Increased program flexibility

（2） Increased program scalability

This is about Python This is the end of the article on the three characteristics of object-oriented . I hope it will be helpful for your study , I also hope you can support the software development network .