What is Python object-oriented? Analyze Python object-oriented examples to decipher

Python has been an object-oriented language from the beginning. Because of this, it is easy to create classes and objects in Python. In this chapter, we will introduce Python object-oriented programming in detail and give Python object-oriented examples for analysis.

If you have not been exposed to object-oriented programming languages ​​​​before, then you may need to first understand some basic features of the Python object-oriented language and form a basic in your mind The concept of object-oriented will help you learn Object-oriented examples and programming of Python more easily.

Next, let’s briefly understand some basic characteristics of object-oriented.

Object-oriented PythonTechnical Introduction

Class (Class): used to describe objects with the same attributes and methods A collection of objects. It defines the properties and methods common to every object in the collection. Objects are instances of classes.

Class variables: Class variables are public throughout the instantiated object. Class variables are defined in the class and outside the function body. Class variables are generally not used as instance variables.

Data members: class variables or instance variables, used to process data related to classes and their instance objects.

Method rewriting: If the method inherited from the parent class cannot meet the needs of the subclass, it can be rewritten. This process is called method override, also known as method rewriting.

Instance variables: Variables defined in methods only act on the class of the current instance.

Inheritance: That is, a derived class inherits the fields and methods of the base class. Inheritance also allows an object of a derived class to be treated as a base class object. For example, there is such a design: an object of type Dog is derived from the Animal class, which simulates the "is-a" relationship (for example, Dog is an Animal).

Instantiation: Create an instance of a class, a specific object of the class.

Method: Function defined in the class.

Object: Data structure instance defined through a class. Objects include two data members (class variables and instance variables) and methods.

Create a class

Use the class statement to create a new class, followed by class is the name of the class and ends with a colon:

class ClassName:
   '类的帮助信息'   #类文档字符串
   class_suite      #类体

The help information of the class can be viewed through ClassName.__doc__.

class_suite consists of class members, methods, and data attributes.

Then, isPython object-oriented instance

The following is an example of a simple Python class:

#!/usr/bin/python
# -*- coding: UTF-8 -*-
 class Employee:   
  '所有员工的基类'
   empCount = 0
 
   def __init__(self, name, salary):    
      self.name = name
     self.salary = salary
     Employee.empCount += 1
   
   def displayCount(self):  
     print "Total Employee %d" % Employee.empCount
 
   def displayEmployee(self):   
     print "Name : ", self.name,  ", Salary: ", self.salary

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