UpdateQuestion.
        [Preview API] Updates an existing question for an extension.
        :param :class:`<Question> <azure.devops.v5_1.gallery.models.Question>` question: Updated question to be set for the extension.
        :param str publisher_name: Name of the publisher who published the extension.
        :param str extension_name: Name of the extension.
        :param long question_id: Identifier of the question to be updated for the extension.
        :rtype: :class:`<Question> <azure.devops.v5_1.gallery.models.Question>`

def update_question(self, question, publisher_name, extension_name, question_id):
        """UpdateQuestion.
        [Preview API] Updates an existing question for an extension.
        :param :class:`<Question> <azure.devops.v5_1.gallery.models.Question>` question: Updated question to be set for the extension.
        :param str publisher_name: Name of the publisher who published the extension.
        :param str extension_name: Name of the extension.
        :param long question_id: Identifier of the question to be updated for the extension.
        :rtype: :class:`<Question> <azure.devops.v5_1.gallery.models.Question>`
        """
        route_values = {}
        if publisher_name is not None:
            route_values['publisherName'] = self._serialize.url('publisher_name', publisher_name, 'str')
        if extension_name is not None:
            route_values['extensionName'] = self._serialize.url('extension_name', extension_name, 'str')
        if question_id is not None:
            route_values['questionId'] = self._serialize.url('question_id', question_id, 'long')
        content = self._serialize.body(question, 'Question')
        response = self._send(http_method='PATCH',
                              location_id='6d1d9741-eca8-4701-a3a5-235afc82dfa4',
                              version='5.1-preview.1',
                              route_values=route_values,
                              content=content)
        return self._deserialize('Question', response)