code: def namespaces(**kwargs):
      '''
      Return the names of the available namespaces
  
      CLI Examples::
  
          salt '*' kubernetes.namespaces
          salt '*' kubernetes.namespaces kubeconfig=/etc/salt/k8s/kubeconfig context=minikube
      '''
      cfg = _setup_conn(**kwargs)
      try:
          api_instance = kubernetes.client.CoreV1Api()
          api_response = api_instance.list_namespace()
  
          return [nms['metadata']['name'] for nms in api_response.to_dict().get('items')]
      except (ApiException, HTTPError) as exc:
          if isinstance(exc, ApiException) and exc.status == 404:
              return None
          else:
              log.exception('Exception when calling CoreV1Api->list_namespace')
              raise CommandExecutionError(exc)
      finally:
          _cleanup(**cfgf namespaces(**kwargs):
      '''
      Return the names of the available namespaces
  
      CLI Examples::
  
          salt '*' kubernetes.namespaces
          salt '*' kubernetes.namespaces kubeconfig=/etc/salt/k8s/kubeconfig context=minikube
      '''
      cfg = _setup_conn(**kwargs)
      try:
          api_instance = kubernetes.client.CoreV1Api()
          api_response = api_instance.list_namespace()
  
          return [nms['metadata']['name'] for nms in api_response.to_dict().get('items')]
      except (ApiException, HTTPError) as exc:
          if isinstance(exc, ApiException) and exc.status == 404:
              return None
          else:
              log.exception('Exception when calling CoreV1Api->list_namespace')
              raise CommandExecutionError(exc)
      finally:
          _cleanup(**cfg)
docs: Return the names of the available namespaces
  
      CLI Examples::
  
          salt '*' kubernetes.namespaces
          salt '*' kubernetes.namespaces kubeconfig=/etc/salt/k8s/kubeconfig context=minikube