How to install threading in python

Since threads are execution units directly supported by the operating system, high-level languages ​​usually have built-in multi-threading support, and Python is no exception. Moreover, Python threads are real Posix Threads, not simulated threads.

Python's standard library provides two modules: _thread and threading. _thread is a low-level module, and threading is a high-level module, which encapsulates _thread. In most cases, we only need to use the advanced module threading. (Recommended learning: Python video tutorial)

To start a thread is to pass a function in and create a Thread instance, and then call start() to start execution:

import time, threading# 新线程执行的代码:def loop():
    print('thread %s is running...' % threading.current_thread().name)
    n = 0
    while n < 5:
        n = n + 1
        print(&#39;thread %s >>> %s' % (threading.current_thread().name, n))
        time.sleep(1)
    print('thread %s ended.' % threading.current_thread().name)

print('thread %s is running...' % threading.current_thread().name)
t = threading.Thread(target=loop, name='LoopThread')
t.start()
t.join()
print('thread %s ended.' % threading.current_thread().name)

Execution The results are as follows:

thread MainThread is running...
thread LoopThread is running...
thread LoopThread >>> 1
thread LoopThread >>> 2
thread LoopThread >>> 3
thread LoopThread >>> 4
thread LoopThread >>> 5
thread LoopThread ended.
thread MainThread ended.

Since any process will start a thread by default, we call this thread the main thread, and the main thread can start new threads. Python's threading module has a current_thread() function, which Always returns an instance of the current thread. The name of the main thread instance is MainThread, and the name of the sub-thread is specified when it is created. We use LoopThread to name the sub-thread. The name is only used for display when printing and has no other meaning at all. If you can't name it, Python will automatically name the thread Thread-1, Thread-2...

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