It's cleaver as hell. But would be great to understand where from if condition are like that - to learn some algebra ;)

Thank you, thank you, thank you! For explanation what is going on there.
And the biggest benefit - since I learn f-strings i almost try to forget about other ways of printing output. Now you bring some power for older strings formating options.

But will work well also without :3 - it will take with *names and unpack from names as many as needed to fill all {} brackets

Thank you for pointing out my missunderstanding. Now it's passed.
Another example how poor tests and not so straight description can ruin developers mind :D