docs: def severity(self):
          """Retrieves the severity for the incident/incidents from the
          output response
  
          Returns:
              severity(namedtuple): List of named tuples of severity for the
              incident/incidents
          """
          resource_list = self.traffic_incident()
          severity = namedtuple('severity', 'severity')
          if len(resource_list) == 1 and resource_list[0] is None:
              return None
          else:
              try:
                  return [severity(resource['severity'])
                          for resource in resource_list]
              except (KeyError, TypeError):
                  return [severity(resource['Severity'])
                          for resource in resource_list]