Bitwise operations: set clear bits, check set bits

bits.py

def set_bit(x, i):
    bi = 0b1 << i
    return x | bi

def xor_bit(x, i):
    bi = 0b1 << i
    return x ^ bi

def clear_bit(x, i):
    bi = ~(0b1 << i)
    return x & bi

# more on topic: https://stackoverflow.com/questions/8898807/pythonic-way-to-iterate-over-bits-of-integer
def check_bits_set(x):
    bit = 1
    bits = []
    while x >= bit:
        if x & bit:
            bits.append(bit)
        bit <<= 1
    return bits