How to use the slackclient.client.SlackNotConnected function in slackclient

:Raises:
            SlackNotConnected if self.server is not defined.
        '''
        # in the future, this should handle some events internally i.e. channel
        # creation
        if self.server:
            json_data = self.server.websocket_safe_read()
            data = []
            if json_data != '':
                for d in json_data.split('\n'):
                    data.append(json.loads(d))
            for item in data:
                self.process_changes(item)
            return data
        else:
            raise SlackNotConnected

:Raises:
            SlackNotConnected if self.server is not defined.
        """
        # in the future, this should handle some events internally i.e. channel
        # creation
        if self.server:
            json_data = self.server.websocket_safe_read()
            data = []
            if json_data != "":
                for d in json_data.split("\n"):
                    data.append(json.loads(d))
            for item in data:
                self.process_changes(item)
            return data
        else:
            raise SlackNotConnected