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From: marc nicole <mk1853387@gmail.com>
Newsgroups: comp.lang.python
Subject: Re: [Tutor] Getting a Process.start() error pickle.PicklingError:
 Can't pickle <type 'module'>: it's not found as __builtin__.module with
 Python 2.7
Date: Tue, 3 Sep 2024 11:34:53 +0200
Lines: 109
Message-ID: <mailman.29.1725356105.2917.python-list@python.org>
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Hello Alan,

Thanks for the reply, Here's the code I tested for the debug:

import time
from multiprocessing import Process

def do_Something():
    print('hello world!')

def start(fn):
   p =3D Process(target=3Dfn, args=3D())
   p.start()

def ghello():
    print ("hello world g")

def fhello():
    print('hello world f')

if __name__ =3D=3D "__main__":
    start(do_something)
    print("executed")
    exit(0)

but neither "Hello World" or "Executed" are displayed in the console which
finishes normally without returning any message.

Module naming is OK and don't think it is a problem related to that.

Now the question, when to use Process/Multiprocess and when to use
Threading in Python?.Thread is there a distinctive use case that can
showcase when to use either? are they interchangeable? to note that using
Threading the console DID display the messages correctly!

Thanks.

Le mar. 3 sept. 2024 =C3=A0 10:48, Alan Gauld via Tutor <tutor@python.org> =
a
=C3=A9crit :

> On 02/09/2024 15:00, marc nicole via Python-list wrote:
> > Hello,
> >
> > I am using Python 2.7 on Windows 10
>
> Others have pointed out that 2.7 is unsupported and has
> been for many years now. Its also inferior in most
> respects including its error reporting.
> If possible you should upgrade to 3.X
>
> > from multiprocessing import Process
> > def do_something(text):
> >     print(text)
> > if __name__ =3D=3D "__main__":
> >     q =3D Process(target=3Ddo_something,args=3D("somecmd") )
> >     q.start()
> >     # following code should execute right after the q.start() call
>
> So what does happen? If you put a print statement here does it execute
> before or after the error message? It might make things easier to
> debug(clearer error traceback) if you put the code to create the thread
> into a separate function?
>
> def do_Something(text)...
>
> def start(fn):
>    q =3D Process....
>    q.start()
>
> if __name_....
>    start(do_something)
>    print('Something here')
>
>
> > But getting the error at the call of Process().start():
> > pickle.PicklingError: Can't pickle <type 'module'>: it's not found as
> > __builtin__.module
>
> But please show us the full error trace even if its not much.
>
> Also check your module naming, is there a possibility
> you've named your file do_something.py or similar?
> (I'm guessing the function is what is being pickled?)
>
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