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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 decode(self):
 """Decode this report into a list of visible readings."""


        parsed_header = self._parse_header(self.raw_report[:self._HEADER_LENGTH])

        auth_size = self._AUTH_BLOCK_LENGTHS.get(parsed_header.auth_type)
        assert auth_size is not None
        assert parsed_header.reading_length % 16 == 0

        time_base = self.received_time - datetime.timedelta(seconds=parsed_header.sent_timestamp)

        readings = self.raw_report[self._HEADER_LENGTH:self._HEADER_LENGTH + parsed_header.reading_length]
        parsed_readings = []

        for i in range(0, len(readings), 16):
            reading = readings[i:i+16]
            stream, _, reading_id, timestamp, value = struct.unpack("<HHLLL", reading)

            parsed = IOTileReading(timestamp, stream, value, time_base=time_base, reading_id=reading_id)
            parsed_readings.append(parsed)

        self.sent_timestamp = parsed_header.sent_timestamp
        self.origin = parsed_header.uuid

        return parsed_readings, []