互斥锁

import time

tick = 100

def func1():
    global tick
    for i in range(100):
        lock.acquire()
        tick +=5            #外部传进来，变成自己的局部变量，与外部无关
        time.sleep(0.01)
        tick -=5
        lock.release()
        print(tick)

def func2():
    global tick
    for i in range(10):
        lock.acquire()
        tick +=10
        time.sleep(0.05)
        tick -=10
        lock.release()
        print(tick)

if __name__=='__main__':
    lock = threading.Lock()
    t1=threading.Thread(target=func1)
    t2=threading.Thread(target=func2)
    t2.setDaemon(True)
    t1.setDaemon(True)
    t1.start()
    t2.start()
    #t1.join()
    #t2.join()```