多線程執行同一任務，不共享局部變量

一、 代碼展示

import threading
import time


# 多線程執行同一任務時，局部變量是不共享的
def sum_num():
    num = 0
    i = 1
    print("我進來了...")
    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()

運行結果

我進來了...
我進來了...
<property object at 0x000002221D4F7E08>:20000000
<property object at 0x000002221D4F7E08>:20000000