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Tue Apr 20 11:58:44 EDT 2004 · https://mail.python.org/pipermail/python-dev/2004-April/044468.html

Brett Cannon wrote:

> ``foo = len(x)`` which loads len (global), loads x (local), 
> calls len, and then stores into foo (local).  ...
> storing built-ins into the local namespace to skip having 
> to try load from the global namespace, fail, and then 
> check the built-in namespace 

An in-between option would be to steal an idea from Jython,
and to make (some?) namespace dictionaries different from 
regular dictionaries. Not only do we know what sorts of keys
are possible, we almost know what every key is at compile time.

-jJ

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[Python-Dev] PEP 329: Treating Builtins as Constants in