code: def get(self, key):
          
          group = self.get_node(key)
          if group is None:
              raise KeyError('No object named {key} in the file'.format(key=key))
          return self._read_group(group)
docs: Retrieve pandas object stored in file
  
          Parameters
          ----------
          key : object
  
          Returns
          -------
          obj : same type as object stored in file