[Python-Dev] peps 329, 266, 267 (original) (raw)

Skip Montanaro skip at pobox.com
Wed Apr 21 17:36:25 EDT 2004 

Phillip> Please note that:

Phillip> 1. None of this is needed in order to optimize builtins.  Names
Phillip>    that are unambiguously builtins can and should be optimized
Phillip>    at compile time.  Names that are ambiguous can use the
Phillip>    existing semantics, and nothing further need be done.

Because module A can modify module B's namespace at runtime the compiler can't tell whether an access to len() will get the builtin or a shadow version. For the above to be true the semantics of modules will have to be changed.

Skip

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