f-strings

Puts values into text.

Synopsis

f"text {value} more text"
f"{number:.2f}"
f"{number:,}"

Description

Put f before the opening quote. Python replaces each { } with the value of what is inside, converting it to text for you.

After a colon you can say how to show a number: .2f means 2 decimal places, and , adds commas.

Parameters

Return value

A str.

Example

name = "David"
x = 3
print(f"hello, {name}")
print(f"{x} squared is {x * x}")
print(f"{3.14159:.2f}")
print(f"{1000000:,}")

It prints:

hello, David
3 squared is 9
3.14
1,000,000

Common mistake

name = "David"
print("hello, {name}")

It prints:

hello, {name}

Without the f, the braces are printed as they are.

See also

print, str, round

f-strings in the Python documentation