| __all__ = ["popCount", "bit_count", "bit_indices"] |
| |
| |
| try: |
| bit_count = int.bit_count |
| except AttributeError: |
| |
| def bit_count(v): |
| return bin(v).count("1") |
| |
| |
| """Return number of 1 bits (population count) of the absolute value of an integer. |
| |
| See https://docs.python.org/3.10/library/stdtypes.html#int.bit_count |
| """ |
| popCount = bit_count # alias |
| |
| |
| def bit_indices(v): |
| """Return list of indices where bits are set, 0 being the index of the least significant bit. |
| |
| >>> bit_indices(0b101) |
| [0, 2] |
| """ |
| return [i for i, b in enumerate(bin(v)[::-1]) if b == "1"] |
