nicolargo / glances

        if item is None:

            return self._json_dumps(s)

        if isinstance(s, dict):

            try:

                return self._json_dumps({item: s[item]})

            except KeyError as e:

                logger.error("Cannot get item history {} ({})".format(item, e))

                return None

        elif isinstance(s, list):

            try:

                # Source:

                # http://stackoverflow.com/questions/4573875/python-get-index-of-dictionary-item-in-list

                return self._json_dumps({item: map(itemgetter(item), s)})

            except (KeyError, ValueError) as e:

                logger.error("Cannot get item history {} ({})".format(item, e))

                return None

        else:

            return None

    def get_trend(self, item, nb=6):

        """Get the trend regarding to the last nb values.

        Stats should be a list of dict (processlist, network...)

        """

        if isinstance(self.stats, dict):

            try:

                return self._json_dumps({item: self.stats[item]})

            except KeyError as e:

                logger.error("Cannot get item {} ({})".format(item, e))

                return None

        elif isinstance(self.stats, list):

            try:

                # Source:

                # http://stackoverflow.com/questions/4573875/python-get-index-of-dictionary-item-in-list

                # But https://github.com/nicolargo/glances/issues/1401

                return self._json_dumps({item: list(map(itemgetter(item), self.stats))})

            except (KeyError, ValueError) as e:

                logger.error("Cannot get item {} ({})".format(item, e))

                return None

        else:

            return None

    def get_stats_value(self, item, value):

        """Return the stats object for a specific item=value in JSON format.