Tim Peters added the comment:
See also:
https://en.wikipedia.org/wiki/Hamming_weight
As that says, there are a number of languages and processors with first class
support for a popcount function. I've frequently implemented it in Python when
using integers as integer bitsets (`i` is in the set if and only if bit `2**i`
is set in the integer), which often - except for finding the cardinality - runs
much faster than using general Python sets.
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nosy: +tim.peters
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