To count number of quadruplets with sum = 0

Paul Rubin http
Fri Mar 16 16:56:01 CET 2007

Steven Bethard <steven.bethard at> writes:
> > According to a post by Raymond Hettinger it's faster to use that
> > iterator instead of `int`.
> Yep. It's because the .next() method takes no arguments, while int()
> takes varargs because you can do:: ...

Heh, good point.  Might be worth putting a special hack in defaultdict
to recognize the common case of defaultdict(int).

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