[issue27220] Add a pure Python version of 'collections.defaultdict'

[Emanuel Barry]

Emanuel Barry added the comment:

I agree that CPython itself gains nothing from having this, as this is so that alternate implementations have it as well. I get what you mean about the minor differences, however I think it's a good thing, as it helps to make sure the tests are precise enough so that there can't be any differences (but that's probably just me).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27220>
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