utils.py

def zero_left_pad(s, l=32):
    """
    Pad a string with '0' such that
    the resulting length equals to
    a fixed amount.

    Args:
        s (str): string to pad
        l (int): length of the resulting string

    Returns:
        str: string padded on the left with '0'
    """
    while len(s) < l: s = '0' + s
    return s

def unot(n):
    """
    Compute the unsigned binary not of a number.

    Args:
        n (int)

    Returns:
        int: computed unsigned binary not
    """

    binary_pattern = zero_left_pad(bin(n)[2:])
    inverted_pattern = ''.join(
        map(lambda d: '0' if d == '1' else '1', binary_pattern)
    )
    return int(inverted_pattern, 2)