Python creates a thread example

import threading
from time import sleep
def test_func(id):
    for i in range(0,5):
        sleep(1)
        print('thread %d is running %d' % (id,i))
threads = []
for i in range(0,3):
    t = threading.Thread(target=test_func, args=(i,))
    threads.append(t)
for t in threads:
    t.start()
for t in threads:
    t.join()

As you can see from the output, the three threads execute alternately