def get_bytes(s):
    'Returns the byte representation of a hex- or byte-string.'
    if isinstance(s, bytes):
        b = s
    elif isinstance(s, str):
        b = bytes.fromhex(s)
    else:
        raise TypeError("s must be either 'bytes' or 'str'!")
    return b
Returns the byte representation of a hex- or byte-string.
def get_bytes(s):
    
    if isinstance(s, bytes):
        b = s
    elif isinstance(s, str):
        b = bytes.fromhex(s)
    else:
        raise TypeError("s must be either 'bytes' or 'str'!")
    return b