John Posner <jjpos...@optimum.net> added the comment:

I think it would be confusing to create of subclass of defaultdict, defining a 
__missing__ method in that subclass. The existence of the __missing__ method 
would cancel the main functionality of the defaultdict object: invoking the 
"default value factory" callable.

I think it would be better to encourage programmers to subclass dict directly, 
instead of subclassing defaultdict.

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status: pending -> open

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue9536>
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