code: def _extract_query(self, redirect_url):
          
          qs = urlparse(redirect_url)
  
          # Implicit Grant redirect_urls have data after fragment identifier (#)
          # All other redirect_urls return data after query identifier (?)
          qs = qs.fragment if isinstance(self, ImplicitGrant) else qs.query
  
          query_params = parse_qs(qs)
          query_params = {qp: query_params[qp][0] for qp in query_params}
  
          return query_params
docs: Extract query parameters from a url.
  
          Parameters
              redirect_url (str)
                  The full URL that the Uber server redirected to after
                  the user authorized your app.
  
          Returns
              (dict)
                  A dictionary of query parameters.