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I guess everyone's answer is similar to this problem solution in Clear category for Binary Count by Lucy2015
def checkio(number):
return bin(number).count('1')
#These "asserts" using only for self-checking and not necessary for auto-testing
if __name__ == '__main__':
assert checkio(4) == 1
assert checkio(15) == 4
assert checkio(1) == 1
assert checkio(1022) == 9
June 2, 2015
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