f-string

f-string(formated string literal)

https://www.python.org/dev/peps/pep-0498/#:~:text=These%20include%20%25%2Dformatting%20%5B1,%5B2%5D%2C%20and%20string.&text=It%20should%20be%20noted%20that,which%20contains%20expressions%20inside%20braces.

PEP 498 -- Literal String Interpolation

index = 1
example = "hello"

print(f'{index+1}:{example}')
--> 2: hello