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Fri Feb 17 08:09:23 CET 2006 · https://mail.python.org/pipermail/python-dev/2006-February/061192.html

Guido van Rossum wrote:
> Feedback?

I would like this to be part of the standard dictionary type,
rather than being a subtype.

d.setdefault([]) (one argument) should install a default value,
and d.cleardefault() should remove that setting; d.default
should be read-only. Alternatively, d.default could be assignable
and del-able.

Also, I think has_key/in should return True if there is a default.

Regards,
Martin

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[Python-Dev] Proposal: defaultdict