python---多线程锁

import threading    #多线程的情况容易出错，就需要加锁了
number = 0

lock = threading.Lock()   #锁   实例化

def add():
    global number
    for i in range(1000):
        with lock:   #自动判断
            number += i

        # lock.acquire() #加锁
        # number+=i
        # lock.release() #解锁

for i in range(10):
    t = threading.Thread(target=add)
    t.start()

while threading.activeCount() !=1:
    pass

print(number)