code: def postinit(self, target=None, iter=None, ifs=None, is_async=None):
          
          self.target = target
          self.iter = iter
          self.ifs = ifs
          self.is_async = is_async
docs: Do some setup after initialisation.
  
          :param target: What is assigned to by the comprehension.
          :type target: NodeNG or None
  
          :param iter: What is iterated over by the comprehension.
          :type iter: NodeNG or None
  
          :param ifs: The contents of any if statements that filter
              the comprehension.
          :type ifs: list(NodeNG) or None
  
          :param is_async: Whether this is an asynchronous comprehension or not.
          :type: bool or None