Python multi-threading application (with examples)

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Before introducing multi-threading, let's first look at a very simple example.

Example:

#单线程实例
import time

def mark(index):
    print("Mark的帅，远近闻名,第%d次传播"%index)
    #暂停一秒，不然看不到效果哦
    time.sleep(1)

if __name__=="__main__":
    for i in range(6):
        mark(i)

Result: Print in order

The above is the single-thread display effect, now Let's use multi-threading to handle it. Before doing this, we should know that the thread module is a relatively low-level module of python.

In order to facilitate us to control threads, python uses the threading module to encapsulate threads. The threading module is used below.

Example:

#多线程实例
import time
import threading

def mark(index):
    print("Mark的帅，远近闻名,第%d次传播"%index)
    #暂停一秒，不然看不到效果哦
    time.sleep(1)

if __name__=="__main__":
    for i in range(6):
        #定义子线程
        t=threading.Thread(target=mark,args=(i,))
        #启动子线程
        t.start()

Effect:

##See the effect, the original single thread, sequential execution , it takes at least 6 seconds, but using multi-threading, it takes just over 1 second to complete, which shows the difference in operating efficiency, which is why we use multi-threading.

2. The main thread will wait for all sub-threads to complete before ending

It is very simple to verify this, just look at the code:

#主线程会等待所有子线程执行完成才结束
import time
import threading

def mark():
    #暂停3秒
    time.sleep(3)
    print("Mark的帅，远近闻")

if __name__=="__main__":
    print("程序开始执行了")
    # 定义子线程
    t = threading.Thread(target=mark)
    # 启动子线程
    t.start()
    print("单线程程序到这里主线程就会结束了，多线程呢，看看吧")

Effect:

Related recommendations:

Python multi-threading example tutorial

Python threading multi-threaded programming example

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