(self, formula, measure, **kwargs)
return (measure, formula)
Memoize using a tuple (measure, formula).
Memoize using a tuple (measure, formula).
Memoize using a tuple ( measure formula ) .
def _get_key(self, formula, measure, **kwargs):
        """Memoize using a tuple (measure, formula)."""
        return (measure, formula)
def _get_key ( self , formula , measure , * * kwargs ) : return ( measure , formula )