The Python standard library provides two modules: _thread and threading. _thread is a low-level module, and threading is a high-level module that encapsulates _thread. For the most part, we just need to use the threading high-level module.

Method 1: Pass in a function and create an instance of Thread, then call start() to start execution

import threading

def loop() :
    for i in range(30) :print(threading.current_thread().name + "-" + str(i))


threadA = threading.Thread(target=loop, name="Thread A")
threadB = threading.Thread(target=loop, name="Thread B")
threadA.start()
threadB.start()
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The following screenshot shows the execution result:

Method 2:Define a class that inherits from the threading.thread class, uses init(self) to initialize it, writes the program to be executed by the Thread in the run(self) method, and then calls start() to execute it

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import threading 
 
class MyThread(threading.Thread) :
    def __init__(self, name) :
        threading.Thread.__init__(self)
        self.name = name
 
    def run(self) :
        for i in range(20) :print(threading.current_thread().name + "-" + str(i))
 
 
threadA = MyThread("Thread A")
threadB = MyThread("Thread B")
threadA.start()
threadB.start()
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The following screenshot shows the execution result:As you can see, the order of threads A and B is mixed in the output.