#!/usr/bin/env python3
    import os 
    from multiprocessing import Process
    
    def child_proc(name):
        print('child process', name, '[',os.getpid(),']','start running...')
    if __name__ == '__main__':
        print('parent process', os.getpid())
        for i in range(5):
            create_childpid = Process(target=child_proc,args=(str(i),))
            print('process will start...')
            create_childpid.start()
        create_childpid.join()
        print('process end')
 

執行：

[email protected]:~/lxz$ vim multiprocessing.py
[email protected]:~/lxz$ chmod +x multiprocessing.py 
[email protected]:~/lxz$ ./multiprocessing.py 

報錯：

Traceback (most recent call last):
  File "./multiprocessing.py", line 3, in <module>
    from multiprocessing import Process
  File "/home/sice/lxz/multiprocessing.py", line 3, in <module>
    from multiprocessing import Process
ImportError: cannot import name 'Process'
 

錯誤的原因是：檔名跟模組名相同導致錯誤

當前檔名為：multiprocessing.py
 模組名：   from  multiprocessing   import Process

解決方法如下： 第1步.（只要檔名與模組名不同就可以了）修改檔名為：aaa.py Linux系統下

[email protected]:~/lxz$ mv multiprocessing.py aaa.py      # 重新命名為 aaa.py

window 環境下重新命名就可以了

第2步. 刪除 multiprocessing.pyc 檔案和 __pycache__資料夾，到這裡已經全部修改好了

 #!/usr/bin/env python3
    import os 
    from multiprocessing import Process
    
    def child_proc(name):
        print('child process', name, '[',os.getpid(),']','start running...')
    if __name__ == '__main__':
        print('parent process', os.getpid())
        for i in range(5):
            create_childpid = Process(target=child_proc,args=(str(i),))
            print('process will start...')
            create_childpid.start()
        create_childpid.join()
        print('process end')