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Thu Dec 29 00:59:09 CET 2005 · https://mail.python.org/pipermail/python-dev/2005-December/059235.html

On 12/29/05, "Martin v. Löwis" <martin at v.loewis.de> wrote:
> If "makes no sense" means "would not make a difference", then you
> are wrong. Objects in a set are not necessarily unmodifiable;
> they just have to be hashable.
>
Oh, you are right. I thought so much about dropping default hash=id,
or more generally that only frozen objects should be hashable, that I
forgot that it's not the case yet... :)

(I used the term "frozen" instead of "immutable" since I think that
"immutable" is not defined very well, because tuples are considered
immutable even though their value can change if they reference mutable
objects.)

Thanks,
Noam

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[Python-Dev] set.copy documentation string