f-strings with variable in format specifier [duplicate]

Question

Can you create a f-string where you use a integer variable for the digits of padding?

>>> s = 8
>>> f"{'test':s}"

With .format() you could solve this doing something like:

>>> "{{:{}}}".format(s).format("test")

I'd use it for printing a list of names, padded by max name length:

s = max(map(len, names))
for n in names:
    print(f"The age of {n:s} is {ages[n]}.")

Answer 1

Put the variable format specifier in curly brackets:

>>> s = 8
>>> f"{'test':s}"
'test'
>>> f"{'test':{s}}"
'test    '