[Python-Dev] peps 329, 266, 267

[Skip Montanaro]

    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.

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