Python f character (formatted string)

About f character (formatted character string)

First of all, note that this is from Python 3.6.

a = 20
s = "you are{}age".format(a)

↓

a = 20
s = f"you are{s}age"

Attach f to the end of the string

of course

a = 20
s = f"you are{s+2}age"

You can also write calculations and Python code in curly braces.

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