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Wed Mar 4 14:17:13 CET 2009 · https://mail.python.org/pipermail/python-dev/2009-March/086712.html

2009/3/3 Jeffrey Yasskin <jyasskin at gmail.com>:
> Unfortunately, I think overloading functions on Number or Iterable
> would be really useful, and constraining it to only look at base
> classes would be unfortunate.

That could well be the case. So the question is, I guess, how would
you write such a function now? Because you could always continue to
write it like that, but make it generic for the other special cases
you didn't think of:

    @simplegeneric
    def foo(x, y):
        if isinstance(x, Iterable):
            do iterable processing
        else:
            do standard base processing

    @foo.register(int)
    def foo_int(x, y):
        do int processing

It's unfortunate that you have to cover it in the base processing, but
certainly no worse than at present.

Paul.

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[Python-Dev] ABCs and MRO