[Python-Dev] special method lookup: how much do we care?

[Georg Brandl]

Benjamin Peterson schrieb:
> A while ago, Guido declared that all special method lookups on
> new-style classes bypass __getattr__ and __getattribute__. This almost
> completely consistent now, and I've been working on patching up a few
> incorrect cases. I've know hit __enter__ and __exit__. The compiler
> generates LOAD_ATTR instructions for these, so it uses the normal
> lookup. The only way I can see to fix this is add a new opcode which
> uses _PyObject_LookupSpecial, but I don't think we really care this
> much. Opinions?

It's easier to introduce a separate opcode like SETUP_WITH; the compilation
of a with statement produces quite a lot of bytecode which could be made
more efficient that way.

Georg

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