数据安全？
    线程锁  GLI 全局解释器锁
        l = threading.Lock()
        l.acquire() # 加锁
        l.release() # 释放锁

demo：

import threading

a=1
l= threading.Lock()
def adda(i):
    l.acquire()  # 线程锁
    print("这是线程",i)
    global a
    a+=1
    print("a等于",a)
    l.release()  # 释放线程锁


for i in range(5):
    t = threading.Thread(target=adda, args=[i, ])  # 创建线程对象
    t.start()  # 启用线程