docs: def has_readable_server(self, read_preference=ReadPreference.PRIMARY):
          """Does this topology have any readable servers available matching the
          given read preference?
  
          :Parameters:
            - `read_preference`: an instance of a read preference from
              :mod:`~pymongo.read_preferences`. Defaults to
              :attr:`~pymongo.read_preferences.ReadPreference.PRIMARY`.
  
          .. note:: When connected directly to a single server this method
            always returns ``True``.
  
          .. versionadded:: 3.4
          """
          common.validate_read_preference("read_preference", read_preference)
          return any(self.apply_selector(read_preference, None))