[Python-Dev] NotImplemented reaching top-level (original) (raw)

Neil Schemenauer nas at arctrix.com
Mon Dec 26 14:52:41 CET 2005

Armin Rigo <arigo at tunes.org> wrote:

Of course, speaking of a rewrite, PyPy does the "right thing" in these two areas. Won't happen to CPython, though. There are too much backward-compatibility issues with the PyTypeObject structure; I think we're doomed with patching the bugs as they show up.

This is definitely something that should be cleaned up for Python 3k.

Looking up in the language reference, I see no mention of NotImplemented in the page about add, radd, etc. I guess it's a documentation bug as well, isn't it? The current code base tries to implement the following behavior: Returning NotImplemented from any of the binary special methods (xxx, rxxx, ixxx) makes Python proceed as if the method was not defined in the first place.

If we agree on this, I could propose a doc fix, a test, and appropriate bug fixes.

I believe that's correct.

Neil

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