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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 timestamp_long_from_uuid(uuid_arg):
 """ Returns an integer value representing a unix timestamp in tenths of microseconds. :param uuid_arg: :return: Unix timestamp integer in tenths of microseconds. :rtype: int """

    if isinstance(uuid_arg, str):
        uuid_arg = UUID(uuid_arg)
    assert isinstance(uuid_arg, UUID), uuid_arg
    uuid_time = uuid_arg.time
    return uuid_time - 0x01B21DD213814000