全局变量传递是否有延迟

- 日理万妓 2023-06-26 12:13 4阅读 0赞

## 全局变量传递是否有延迟 ##

**测试内容：** 开启线程，在不同的线程中做while循环，使用全局变量传递函数，测试数据是否有丢失。  
**测试结果：** 全局变量在两个不同的`def()`中运行，主要是def()自身运行时间决定，如果两个`def()`运行时间不一致，便会出现数据丢失。

**代码：**

import os
    import sys
    import time
    import threading
    
    shu1 = 0
    
    def test1():
        global shu1
        while 1:
            time.sleep(0.01)
            print("test1:", shu1)
    
    def test2():
        global shu1
        while 1:
            for zz in range(10):
                shu1 = shu1 + 1
                time.sleep(0.01)
            print("test2:", shu1)
    
    def test3():
        pass
    
        # global shu1
        # while 1:
        #     time.sleep(0.01)
        #     print("test3:", shu1)
    if __name__ == '__main__':
        test_one = threading.Thread(target = test1)
        test_two = threading.Thread(target = test2)
        test_three = threading.Thread(target = test3)
        test_one.start()
        test_two.start()
        test_three.start()

**运行结果：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1JOR191emlf_size_16_color_FFFFFF_t_70]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1JOR191emlf_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200101114659724.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1JOR191emlf,size_16,color_FFFFFF,t_70