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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def decodepackbits(encoded):
 """Decompress PackBits encoded byte string. PackBits is a simple byte-oriented run-length compression scheme. """

    func = ord if sys.version[0] == '2' else lambda x: x
    result = []
    i = 0
    try:
        while True:
            n = func(encoded[i]) + 1
            i += 1
            if n < 129:
                result.extend(encoded[i:i+n])
                i += n
            elif n > 129:
                result.extend(encoded[i:i+1] * (258-n))
                i += 1
    except IndexError:
        pass
    return b''.join(result) if sys.version[0] == '2' else bytes(result)