Not sure, why you think they cannot be used with defered interpolation. You, can easily combine the two like this: >>> f'{"fstring"} and {{deferred}}'.form

Not sure, why you think they cannot be used with defered interpolation. You, can easily combine the two like this: >>> f'{"fstring"} and {{deferred}}'.format(deferred=1234) 'fstring and 1234'