多线程执行同一任务，不共享局部变量

Posted 2021-02-20 fry-hell

多线程执行同一任务，不共享局部变量

一、 代码展示

import threading
import time


# 多线程执行同一任务时，局部变量是不共享的
def sum_num():
    num = 0
    i = 1
    print("我进来了...")
    time.sleep(1)
    while i <= 20000000:
        num += 1
        i += 1
    print("%s:%d" % (threading.Thread.name, num))


def main():
    t1 = threading.Thread(target=sum_num)
    t2 = threading.Thread(target=sum_num)

    t1.start()
    t2.start()


if __name__ == "__main__":
    main()

运行结果

我进来了...
我进来了...
<property object at 0x000002221D4F7E08>:20000000
<property object at 0x000002221D4F7E08>:20000000