python多线程中锁怎么使用？

# 锁

import time

from threading import Thread

from threading import Lock

def func():

    global n

    lock.acquire()

    temp = n  # 从进程中获取n

    time.sleep(0.01)

    n = temp-1  # 得到结果再存储回进程

    lock.release()

n = 100

lock = Lock()

t_lis = []

for i in range(100):

    t = Thread(target=func)

    t.start()

    t_lis.append(t)

[t.join() for t in t_lis]

print(n)