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Sun Dec 25 12:35:50 CET 2005 · https://mail.python.org/pipermail/python-dev/2005-December/059052.html

Hi Facundo,

On Sat, Dec 24, 2005 at 02:31:19PM -0300, Facundo Batista wrote:
> >>> d += 1.2
> >>> d
> NotImplemented

The situation appears to be a mess.  Some combinations of specific
operators fail to convert NotImplemented to a TypeError, depending on
old- or new-style-class-ness, although this is clearly a bug (e.g. in an
example like yours but using -= instead of +=, we get the correct
TypeError.)

Obviously, we need to write some comprehensive tests about this.  But
now I just found out that the old, still-pending SF bug #847024 about
A()*5 in new-style classes hasn't been given any attention; my theory is
that nobody fully understands the convoluted code paths of abstract.c
any more :-(

A bientot,

Armin

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[Python-Dev] NotImplemented reaching top-level