old_contents: #!/usr/bin/python
  # coding: utf-8
  __author__ = 'lhfcws'
  
  
  class RDirNode(object):
      """ Node of rdir dict.
      This is a immutable class.
      """
  
      def __init__(self, fullname, doc, obj_type, children):
          """ Init
          :param name: object full name like "urllib2.opener"
          :param doc: object document
          :param obj_type: object type
          :param children: object's sub-objects
          """
          assert isinstance(fullname, type(""))
          assert isinstance(children, type({}))
  
          self.name = fullname
          self.doc = doc
          if isinstance(obj_type, type("")):
              self.type = obj_type
          else:
              self.type = str(obj_type)
  
          self.children = children
  
      def count_children(self):
          """ Size of the children.
          :return: int size of the children
          """
          return len(self.children)
  
      def list_children(self):
          """ List the keys of self.children
          :return: list [sub-object's name]
          """
          return self.children.keys
  
      def get_children(self, key):
          """ Get a child node by a given key
          :param key: str sub-object's name
          :return: RDirNode node of the sub-object
          """
          assert isinstance(key, type(""))
          return self.children[key]
  
      def get_name(self):
          """ Get the object's own name.
          :return: str var name
          """
          return self.name.split(".")[-1]
new_contents: #!/usr/bin/python
  # coding: utf-8
  __author__ = 'lhfcws'
  
  
  class RDirNode(object):
      """ Node of rdir dict.
      This is a immutable class.
      """
  
      def __init__(self, fullname, doc, obj_type, children):
          """ Init
          :param name: object full name like "urllib2.opener"
          :param doc: object document
          :param obj_type: object type
          :param children: object's sub-objects
          """
          assert isinstance(fullname, type(""))
          assert isinstance(children, type({}))
  
          self.name = fullname
          self.doc = doc
          if isinstance(obj_type, type("")):
              self.type = obj_type
          else:
              self.type = str(obj_type)
  
          self.children = children
  
      def count_children(self):
          """ Size of the children.
          :return: int size of the children
          """
          return len(self.children)
  
      def list_children(self):
          """ List the keys of self.children
          :return: list [sub-object's name]
          """
          return self.children.keys()
  
      def get_children(self, key):
          """ Get a child node by a given key
          :param key: str sub-object's name
          :return: RDirNode node of the sub-object
          """
          assert isinstance(key, type(""))
          return self.children[key]
  
      def get_name(self):
          """ Get the object's own name.
          :return: str var name
          """
          return self.name.split(".")[-1]
  
subject: fix a bug.