code: def get(self, key, default=UndefinedKey):
          
          return self._get(ConfigTree.parse_key(key), 0, default)
docs: Get a value from the tree
  
          :param key: key to use (dot separated). E.g., a.b.c
          :type key: basestring
          :param default: default value if key not found
          :type default: object
          :return: value in the tree located at key