code: def reverse_search_history(self, e):  # (C-r)
          u'''Search backward starting at the current line and moving up
          through the history as necessary. This is an incremental search.'''
          log("rev_search_history")
          self._init_incremental_search(self._history.reverse_search_history, e)
          self.finalize(f reverse_search_history(self, e):  # (C-r)
          u'''Search backward starting at the current line and moving up
          through the history as necessary. This is an incremental search.'''
          log("rev_search_history")
          self._init_incremental_search(self._history.reverse_search_history, e)
          self.finalize()
docs: u'''Search backward starting at the current line and moving up
          through the history as necessary. This is an incremental search.