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Sun Dec 25 12:37:53 CET 2005 · https://mail.python.org/pipermail/python-dev/2005-December/059053.html

Armin Rigo wrote:
> 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 :-(

Time for a rewrite?

Reinhold

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[Python-Dev] NotImplemented reaching top-level