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 = Process(target=fn, args=())
p.start()
def ghello():
print ("hello world g")
def fhello():
print('hello world f')
if __name__ == "__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 à 10:48, Alan Gauld via Tutor <tu...@python.org> a
écrit :
> 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__ == "__main__":
> > q = Process(target=do_something,args=("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 = 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?)
>
> > anybody could provide an alternative to call the function do_something()
> in
> > a separate thread ?
>
> Why not just use the Threading module?
> If it's as simple as just running something in a
> thread multiprocessing is probably not needed.
>
> --
> Alan G
> Author of the Learn to Program web site
> http://www.alan-g.me.uk/
> http://www.amazon.com/author/alan_gauld
> Follow my photo-blog on Flickr at:
> http://www.flickr.com/photos/alangauldphotos
>
>
>
> _______________________________________________
> Tutor maillist - tu...@python.org
> To unsubscribe or change subscription options:
> https://mail.python.org/mailman/listinfo/tutor
>
--
https://mail.python.org/mailman/listinfo/python-list
