code: def call(self, params):
          
          return json.loads(self._fetch_http(self._api_url, params))
docs: Make an API call to the wiki. *params* is a dictionary of query string
          arguments. For example, to get basic information about the wiki, run:
  
          >>> wiki.call({'action': 'query', 'meta': 'siteinfo'})
  
          which would make a call to
          ``http://domain/w/api.php?action=query&meta=siteinfo&format=json``
          (except the query string would be sent in POST).
  
          :param params: dictionary of query string parameters
          :returns: dictionary containing API response