How do F strings in a variable work correctly?

Question

Python

Hello.
I have a line string1 = '{title} added. Which add more?'
It is stored in the database.
How can I make the string1 F variable a string so that the title variable will work?

I tried like this

string1 = '{title} added. Which add more?'
title = 'blabla'
print(f'{string1}')

But that doesn't work. title is displayed not as a variable, but as text.

It is necessary to alter a normal line in F a line in a variable.

Answer 1

string1.format(title=title)

Answer 2

string1 = f'{title} added. Which add more?'

Answer 3

https://pythonworld.ru/osnovy/formatirovanie-strok...

Answer 4

>>> def makef(nonf: str) -> str:
...     return eval(f'f"{nonf}"')
... 
>>> title = 'name'
>>> s = 'some {title}'
>>> print(makef(s))
some name

But you have to be very careful and validate everything that comes from the database

Answer 5

>>> title = "asd"
>>> string1 = f'{title} added. Which add more?'
>>> print(string1)
asd added. Which add more?

And it works. It is possible without format.
Only if the user enters data in string1, there may be a problem, he can enter not intended, i.e. hidden variables like key, token, password, something like that. So be careful here.