code: def postinit(self, key=None, value=None, generators=None):
          
          self.key = key
          self.value = value
          if generators is None:
              self.generators = []
          else:
              self.generators = generators
docs: Do some setup after initialisation.
  
          :param key: What produces the keys.
          :type key: NodeNG or None
  
          :param value: What produces the values.
          :type value: NodeNG or None
  
          :param generators: The generators that are looped through.
          :type generators: list(Comprehension) or None