[Python-3000] PEP 3119 - Introducing Abstract Base Classes (original) (raw)

Thomas Lotze thomas at thomas-lotze.de
Fri Apr 27 21:47:30 CEST 2007

Jim Jewett wrote:

Yes, but it is a TypeError today. Is it worth the backwards compatibility?

I'd say yes for the sake of doing things right, in particular as we are talking about Py3k, but then I don't think I have a good picture of all the things that would be broken by this change.

That makes sense. Looking at unordered containers like sets, should

{"a", "b"} in {"b", "a", "d"} be able to return true, by deriving from Searchable?

No. {"a", "b"} clearly is a subset of {"b", "a", "d"}, not an element. So {"a", "b"} < {"b", "a", "d"}, but {"a", "b"} not in {"b", "a", "d"}.

-- Thomas

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