[problem description]

The following code can run normally in Linux, but an error is reported in windows.

import multiprocessing

def fun():  # Child process function
     print("child process execution")

p = multiprocessing .Process(target=fun) # Create process object

p.start() # Start the process

p.join() # Recycle process

[solution]

Add code as prompted:

if __name__ == '__main__':
    multiprocessing.freeze_support()

Adding only the above code will still report an error (the same error).

The code for creating process objects, starting processes, and recycling processes should also be placed in __ main__ protection

import multiprocessing

def fun():  # Child process function
     print("child process execution")

if __name__ =='__main__':
     multiprocessing.freeze_support() # Doesn't seem to be added?

     p = multiprocessing.Process(target=fun) # Create process object

     p.start() # Start the process

     p.join() # Recycle process

Done.