[Python-Dev] Proposal: defaultdict

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

    Fredrik> and keys should return all possible key values!

I think keys() and in should reflect reality.  Only when you do something
like

    x = d['nonexistent']

or

    x = d.get('nonexistent')

should the default value come into play.

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