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Python object-oriented primary knowledge is what, I believe that many inexperienced people are helpless about this, this article summarizes the causes and solutions of the problem, through this article I hope you can solve this problem.

overview

Process-oriented: writing code from top to bottom according to business logic

Functional formula: encapsulate a certain function code into a function, so that there is no need to write it repeatedly in the future, just call the function.

Object orientation: Classifying and encapsulating functions to make development "faster, better and stronger... "

Process-oriented programming is most easily accepted by beginners. It often uses a long piece of code to implement a specified function. The most common operation in the development process is paste copy, that is, copying the previously implemented code block to the current function.

def Send mail (content)

#Send email alerts

Connect Mailbox Server

send mail

close the connection

while True：

If CPU utilization> 90%:

Send Mail ('CPU Alarms')

if hard disk usage> 90%:

Send Mail ('Hard Drive Alarms')

if memory usage> 80%:

Send Mail ('Memory Alarms')

Today we're going to learn about a new way of programming: Object Oriented Programming (OOP).

Note: Java and C#only support object-oriented programming, while python is more flexible that supports object-oriented programming and functional programming.

Create classes and objects

Object-oriented programming is a programming method, which needs to be realized by using "class" and "object". Therefore, object-oriented programming is actually the use of "class" and "object".

A class is a template, which can contain multiple functions, and some functions are implemented in the function

An instance object is an instance created from the template, through which the functions in the class can be executed

class is a keyword that indicates a class

Create an object with parentheses after the class name

ps: The first parameter of the function in the class must be self (see: Encapsulation of the three major characteristics of the class for details)

The functions defined in the class are called "methods."

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