1__all__ = ["popCount"] 2 3 4try: 5 bit_count = int.bit_count 6except AttributeError: 7 8 def bit_count(v): 9 return bin(v).count("1") 10 11 12"""Return number of 1 bits (population count) of the absolute value of an integer. 13 14See https://docs.python.org/3.10/library/stdtypes.html#int.bit_count 15""" 16popCount = bit_count 17 18 19def bit_indices(v): 20 """Return list of indices where bits are set, 0 being the index of the least significant bit. 21 22 >>> bit_indices(0b101) 23 [0, 2] 24 """ 25 return [i for i, b in enumerate(bin(v)[::-1]) if b == "1"] 26