Checking That Two Args Are Of Same Type (Posting On Python-List Prohibited)

Consider a function taking two args “a” and “b”, which can be of str,
bytes or bytearray type, just so long as both are of the same type.
One easy way to test this is

    if sum(isinstance(a, t) and isinstance(b, t) for t in (str, bytes, bytearray)) != 1 :
        raise TypeError("args must both be str or bytes")
    #end if

Actually, both “and’ and “or” will work.