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Default dictionary (See related posts)

I always want to do this, like I did in Perl.
>> d = DefaultDict(0)
>> d[key] += 1     # no need to use d.get or d.setdefault

>> d = DefaultDict([])  # similarly with list value
>> d[key].append(item)

See the implementation by Peter Norvig (of AI & Google fame)
here
to python default dict by korakot on Wed Sep 14 21:11:37 -0400 2005

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