code: def get_stats_value(self, item, value):
          
          if not isinstance(self.stats, list):
              return None
          else:
              if value.isdigit():
                  value = int(value)
              try:
                  return self._json_dumps({value: [i for i in self.stats if i[item] == value]})
              except (KeyError, ValueError) as e:
                  logger.error(
                      "Cannot get item({})=value({}) ({})".format(item, value, e))
                  return None
docs: Return the stats object for a specific item=value in JSON format.
  
          Stats should be a list of dict (processlist, network...)