def bands(self, telescope):
        """Return a list of bands associated with the specified telescope."""
        q = self._seen_bands.get(telescope)
        if q is None:
            return []
        return list(q)
def bands ( self , telescope ) : q = self . _seen_bands . get ( telescope ) if q is None : return [ ] return list ( q )
Return a list of bands associated with the specified telescope.