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Showing content from https://mail.python.org/pipermail/python-dev/2006-February/061274.html below:

[Python-Dev] Proposal: defaultdict

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Guido van Rossum wrote:
> On 2/17/06, Thomas Heller <theller at python.net> wrote:
>> Ahem, I'm still looking for ways to 'overtake' the dict to implement
>> weird and fancy things.  Can on_missing be overridden in subclasses (writing
>> the subclass in C would not be a problem)?
> 
> Why ahem?
> 
> The answer is yes.

Ok, so that allows to pass the key, for example, to the default_factory -
allowing the case insensitive lookup in namespaces.

Thomas

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