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From: Antoine Pitrou <solipsis@pitrou.net>
Subject: Re: The opener parameter of Python 3 open() built-in
Date: Thu, 6 Sep 2012 00:34:56 +0000 (UTC)
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Xref: csiph.com comp.lang.python:28546

Chris Angelico <rosuav <at> gmail.com> writes:
> 
> On Wed, Sep 5, 2012 at 5:16 AM, Terry Reedy <tjreedy <at> udel.edu> wrote:
> > io.open depends on a function the returns an open file descriptor. opener
> > exposes that dependency so it can be replaced.
> 
> I skimmed the bug report comments but didn't find an answer to this:
> Why not just monkey-patch? When a module function calls on a support
> function and you want to change that support function's behaviour,
> isn't monkey-patching the most usual?

Monkey-patching globals is not thread-safe: other threads will see your
modification, which is risky and fragile.

Regards

Antoine.


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