def _process_execute_payload(self, item):
        handler = self._payload_handlers.get(item['source'])
        if handler is None:
            # We have no handler for this type of payload, simply ignore it
            return False
        else:
            handler(item)
            return True
Reimplemented to dispatch payloads to handler methods.
dataset/ETHPy150Open ipython/ipython-py3k/IPython/frontend/qt/console/ipython_widget.py/IPythonWidget._process_execute_payload