code: def postinit(self, value, conversion=None, format_spec=None):
          
          self.value = value
          self.conversion = conversion
          self.format_spec = format_spec
docs: Do some setup after initialisation.
  
          :param value: The value to be formatted into the string.
          :type value: NodeNG
  
          :param conversion: The type of formatting to be applied to the value.
          :type conversion: int or None
  
          :param format_spec: The formatting to be applied to the value.
          :type format_spec: JoinedStr or None