[Python-Dev] bpo-34837: Multiprocessing.Pool API Extension - Pass Data to Workers w/o Globals

Antoine Pitrou solipsis at pitrou.net
Sat Sep 29 08:17:59 EDT 2018

On Sat, 29 Sep 2018 08:13:19 -0400
Sean Harrington <seanharr11 at gmail.com> wrote:
> >
> > Hmm...  We might have a disagreement on the target audience of the
> > multiprocessing module.  multiprocessing isn't very high-level, I would
> > expect it to be used by experienced programmers who know how to mutate
> > a global variable from a lexical scope.
> >  
> >>> It is one thing to MUTATE  a global from a lexical scope. No gripes  
> there. The specific concept I'm referencing here, is "DECLARING a global
> variable, from within a lexical scope". This is not as a intuitive for most
> programmers.

Well, you don't have to.  You can bind it to None in the top-level
scope and then mutate it from the lexical scope:

my_resource = None

def do_work():
    global my_resource
    my_resource = ...



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