[issue12473] factory func of collections.defaultdict should receive the "missing key" as args when called.

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

-1. Besides compatibility issues, defaultdict is a dict: it contains data, and is not meant to consume CPU when accessing items. Its "default" function should return initial values, like 0 or an empty list.

I think what you want is "memoization"; a memoized function still looks like a function! there are many implementations for python, one of these is here: http://wiki.python.org/moin/PythonDecoratorLibrary#Memoize

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nosy: +amaury.forgeotdarc
resolution:  -> invalid
status: open -> closed

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<http://bugs.python.org/issue12473>
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