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Date: Fri, 12 Oct 2012 01:25:27 +1100
Subject: Re: __builtins__ thread-safe / __builtins__ as function?
From: Chris Angelico <rosuav@gmail.com>
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Xref: csiph.com comp.lang.python:31121

On Fri, Oct 12, 2012 at 1:16 AM, Juergen Bartholomae
<bartholomae.juergen@googlemail.com> wrote:
> One possible solution  is to somehow redirect every __builtins__ to a
> function that returns a different __builtins__ dictionary for each thread
> (such a function already exists).

How exactly does the code reference it? If they're simply referring to
the name __builtins__ at module level, you ought to be able to import
the module, then assign some_module.__builtins__ to your thread-local
object, then call code in it as normal.

An interesting problem, and one where monkeypatching is, imho, justified.

ChrisA