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


On Sat, Sep 29, 2018 at 8:18 AM Antoine Pitrou <solipsis at pitrou.net> wrote:

> 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 = ...
>
> >>> Yes but this is even more constraining, as it forces the parent
process to declare a global variable that it likely never uses!



> Regards
>
> Antoine.
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