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Default Dictionary

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        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) 
<a href=>here</a>