python-Base Object-oriented

Catalogue1. Introduction to Object-oriented programming2. Why should I use object-oriented development? 3. Object-oriented features: encapsulation, inheritance, polymorphism4. Classes, Methods1. Introduction to Object-oriented programming　　OOP (object oriented programing Programming is the use of "class" and "object" to create a variety of models to achieve a real-world description, the use of object-oriented programming because it can make the maintenance and extension of the program easier, and can greatly improve the efficiency of program development , in addition, An object-oriented program can make it easier for people to understand your code logic and make team development easier. the core features of object-oriented are as follows:　　

Class	Templates of the same property
Object objects	Instances that are instantiated through a class (template). A class is instantiated before it can be called in a program. A class can instantiate multiple objects. Each object can have different properties
Encapsulation Package	Contains the data and methods of the class. The assignment of data in a class. Internal calls are transparent to external users 1. Prevent data from being arbitrarily modified 2. External procedures do not need to focus on the structure of the object. Logical structure. You only need direct access through the interface provided externally by this object.
Inheritance inheritance	Subclass inherits the method of the parent class (note: can be overridden)
Polymorphism Polymorphism	An interface. Multiple forms (Implementation) A different subclass is derived from a parent class. Each subclass inherits the same method name and does not implement each method name at the same time. Multiple forms of the same thing

No matter what the form of programming, we have to clearly remember the following principles:
Writing duplicate code is a very bad low-level behavior.
The code you write needs to change frequently.

In the development must try to avoid writing duplicate code, otherwise it is equivalent to dig a hole for themselves.

When developing a regular program. Write code must follow the principle of easy to read, easy to change (professional data called readability, easy to expand).

If you copy and paste a piece of the same code into multiple places of the program to invoke this function in various parts of the program, you will need to change it in many places in the future. Because if you accidentally missed a place and didn't change it, That could lead to a problem with the entire program running. In the development must try to avoid writing duplicate code, otherwise it is equivalent to dig a hole for themselves.

The main role of OOP programming is to make your code modifications and extensions easier

python-Base Object-oriented