def url_defaults(self, f):
        """Callback function for URL defaults for this blueprint.  It's called
        with the endpoint and values and should update the values passed
        in place.
        """
        self.record_once(lambda s: s.app.url_default_functions
            .setdefault(self.name, []).append(f))
        return f
def url_defaults ( self , f ) : self . record_once ( lambda s : s . app . url_default_functions . setdefault ( self . name , [ ] ) . append ( f ) ) return f
Callback function for URL defaults for this blueprint.  It's called
        with the endpoint and values and should update the values passed
        in place.