[python3] Python implements multi-threading (simple operation)

When you use python to develop or test, you will inevitably use python's multi-threading operation. Let me briefly introduce the two basic implementation methods of multi-threading:

[Explanation] :
(1) The third-party library we need to use in multi-threading is threading;
(2) The thread must be attached to the process;
(3) The thread will be automatically released after execution.

Method 1 : Object-oriented method to implement multi-threading

# -*- coding: utf-8 -*-
import threading
class CThread (threading.Thread):
    def __init__(self, n):
        threading.Thread.__init__(self)  #重写父类方法
        self.num = n

    def run(self):
    	print(self.num)
    	
 if __name__ == "__main__":
    a = CThread(1)  # 开启一个线程
    a.start()       # 启动线程
	
	# 开启多个线程
    # for i in range(6): 
    #	a = CThread(i)  # 连续开启多个线程
    #	a.start()       # 启动线程
	

Method 2: Process-oriented method to implement multi-threading

import threading
import time

def download(i):
    print('开始下载文件%d'%i)
    time.sleep(1)
    print('文件下载完成')

if __name__=='__main__':
  #多线程
  for i in range(5):#利用循环创建5个线程
      t=threading.Thread(target=download,args=(i,))
      print(len(threading.enumerate()))  #查看线程数量和进程数量总和
      #启动线程
      t.start()

It's very simple. I will talk about thread locks and other related content in detail later. If it is helpful to you, please like + follow and go! ! !