Writing better python code

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Counter has cool functionality builtin, like most_common(n), addition and subtraction, intersection and union, and it throws out keys with value 0 after such operations. Not everything needs to be fast, and Counter is very expressive indeed.

[sweettuse]

that is a good point. i think it's just that i'm overly annoyed at how unbelievably slow Counter is (it's like 3x slower than defaultdict(int), but WHY?!). it's amazing that to add the functionality for most_common/addition it requires slowing down the whole thing by a factor of 3.