code: def get_title(self, index):
          
          # JSON dictionaries have string keys, so we convert index to a string
          index = unicode_type(int(index))
          if index in self._titles:
              return self._titles[index]
          else:
              return None
docs: Gets the title of a container pages.
  
          Parameters
          ----------
          index : int
              Index of the container page