String Formatting

f-strings (recommended)

Prefix a string with f and put expressions in curly braces.

name = "Alice"
age = 30
print(f"{name} is {age} years old")

.format() method

An older style using placeholders {}.

print("Hello, {}! You are {}.".format("Bob", 25))

Number formatting

Control decimal places, padding, and alignment.

pi = 3.14159
print(f"Pi is {pi:.2f}")
print(f"{'hello':>20}")
print(f"{42:05d}")

Try it yourself

Run the example below. Edit it and see what changes.

price = 19.99
print(f"Total: ${price:.2f}")
 

Common mistakes

• ⚠Forgetting the f prefix in f-strings.
• ⚠Mixing f-string and .format() in the same string.