code: def get_command_completers(self, namespace, command):
          # type: (str, str) -> CompletionInfo
          
          # Find the method (can raise a KeyError)
          method = self._commands[namespace][command]
  
          # Return the completer, if any
          return getattr(method, ATTR_COMPLETERS, None)
docs: Returns the completer method associated to the given command, or None
  
          :param namespace: The command name space.
          :param command: The shell name of the command
          :return: A CompletionConfiguration object
          :raise KeyError: Unknown command or name space