code: def previous_pages_numbers(self):
          'A generator of previous page integers.'
          count = self._previous_pages_count() + 1
          for i in reversed(range(1, count)):
              yield f previous_pages_numbers(self):
          'A generator of previous page integers.'
          count = self._previous_pages_count() + 1
          for i in reversed(range(1, count)):
              yield i
docs: A generator of previous page integers.