f-strings

f-strings

In this tutorial, we'll use f-strings to place values inside text.

An f-string is a string with an f before the opening quote.

name = "Mia"
print(f"Hello, {name}")

Output:

Hello, Mia

The value inside {} is inserted into the string.

Using Multiple Values

name = "Mia"
score = 87

print(f"{name} scored {score}")

Output:

Mia scored 87

You do not need to convert score with str(). The f-string handles that.

Expressions Inside Braces

You can put simple expressions inside {}:

price = 5
quantity = 4

print(f"Total: {price * quantity}")

Output:

Total: 20

Keep expressions short. If the calculation is complicated, store it in a variable first.

Using Methods Inside f-strings

name = "ada"

print(f"Hello, {name.capitalize()}")

Output:

Hello, Ada

Common Mistake

Forgetting the f means Python prints the braces as text:

name = "Mia"
print("Hello, {name}")

Output:

Hello, {name}

Correct:

print(f"Hello, {name}")

Use Clear Variable Names

F-strings are easiest to read when the variable names are clear:

customer_name = "Mia"
order_total = 18.50

print(f"{customer_name} owes £{order_total}")

This reads almost like English. If you find an f-string hard to understand, the problem might be the variable names, not the f-string itself.

Practice

Create variables for product, price, and quantity. Use an f-string to print a receipt line.