[Python-3000] Generic function PEP won't make it in time

[Greg Ewing]

Do we really need to have B&D-ish enforcement of abstract
method implementation? It doesn't seem pythonic to me.
I might want to leave some methods of an ABC unimplemented
because I'm not intending to use them. I'd be annoyed if
I were prevented from doing that because of some theoretical
notion that they "should" be implemented.

--
Greg