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python Programming Glossary: lenbProfiled performance of len(set) vs. set.__len__() in Python 3 http://stackoverflow.com/questions/8778691/profiled-performance-of-lenset-vs-set-len-in-python-3 cProfile def lenA s for i in range 1000000 len s def lenB s for i in range 1000000 s.__len__ def main s set lenA s lenB.. s for i in range 1000000 s.__len__ def main s set lenA s lenB s if __name__ __main__ cProfile.run main stats According to.. stats below lenA seems to be 14 times slower than lenB ncalls tottime percall cumtime percall filename lineno function..
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