Source: 📖 Effective Python item 4

F-strings allow a full expression to be placed within specifier braces

As well as referencing any variable within the current scope, you can also combine these variables with expressions within f-string specifier braces {}.

first_last = ['Juan', 'Coquet']

formatted = "My name is {' '.join(first_last)}."

print(formatted)

>>>
My name is Juan Coquet.

See also:

• Advanced .format specifier uses
• Interpolated f-strings allow referencing of any variable in the current scope