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Showing content from https://mail.python.org/pipermail/python-dev/2012-March/117394.html below:

[Python-Dev] Adding a builtins parameter to eval(), exec() and __import__().

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2012/3/7 Mark Shannon <mark at hotpy.org>:
> Currently, it is impossible to allow one function access to sensitive
> functions like open(), while denying it to others, as any code can then
> get the builtins of another function via f.__globals__['builtins__'].
> Separating builtins from globals could solve this.

I like this idea. We could finally kill __builtins__, too, which has
often been confusing for people.


-- 
Regards,
Benjamin

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