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[Python-Dev] defaultdict proposal round three

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Guido van Rossum wrote:

> I see two alternatives.

Have you considered the third alternative that's been
mentioned -- a wrapper?

The issue of __contains__ etc. could be sidestepped by
not giving the wrapper a __contains__ method at all.
If you want to do an 'in' test you do it on the
underlying dict, and then the semantics are clear.

Greg

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