threading：线程创建、启动、睡眠、退出

1.方法一：将要执行的函数作为参数传递给threading.Thread()

import threading
 
import time
 
def func(n):
 
    global count
 
    time.sleep(0.1)
 
    for i in range(n):
 
        count += 1
 
if __name__ == '__main__':
 
    count = 0
 
    threads = []
 
    for i in range(5):
 
        threads.append(threading.Thread(target=func, args=(1000,)))
 
    for t in threads:
 
        t.start()
 
    time.sleep(5)
 
    print('count:', count)

2.方法二：继承treading.Thread()类，并重写run()

import threading
 
import time
 
class myThread(threading.Thread):
 
    def __init__(self, n):
 
        threading.Thread.__init__(self)
 
        self.myThread_n = n
 
    def run(self):
 
        global count
 
        for i in range(self.myThread_n):
 
            count += 1
 
if __name__ == '__main__':
 
    cout = 0
 
    threads = []
 
    for i in range(5):
 
        threads.append(myThread(1000))
 
    for t in threads:
 
        t.start()
 
    time.sleep(5)
 
    print('count:', count)