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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 connect(self):
 """ Construct the psycopg2 connection instance :return: psycopg2.connect instance """


        if self._conn:
            return self._conn

        self._conn = psycopg2.connect(
            self.config,
            cursor_factory=psycopg2.extras.RealDictCursor,
        )

        self._conn.set_session(autocommit=True)
        psycopg2.extras.register_hstore(self._conn)

        return self._conn