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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 close(self):
 """ Close the session. This will release any borrowed resources, such as connections, and will roll back any outstanding transactions. """

        from neobolt.exceptions import ConnectionExpired, CypherError, ServiceUnavailable
        try:
            if self.has_transaction():
                try:
                    self.rollback_transaction()
                except (CypherError, TransactionError, SessionError, ConnectionExpired, ServiceUnavailable):
                    pass
        finally:
            self._closed = True
        self._disconnect(sync=True)