Strings and formatted output

A string is text enclosed in matching single or double quotes. You can put variable values into a message with an f-string: write f immediately before the opening quote and put each variable name inside braces.

name = "Sam"
sessions = 3
print(f"{name} planned {sessions} sessions.")

Sam planned 3 sessions.

Join text carefully

The + operator joins strings. It does not automatically turn an int into text. An f-string converts displayed values to text for the message.

first = "Python"
second = "practice"
print(first + " " + second)
minutes = 25
print(f"Each session is {minutes} minutes.")

Python practice
Each session is 25 minutes.

Why this works

An f-string evaluates expressions inside braces when that line runs. If a variable changes, a later f-string uses its new value. The f prefix must be immediately before the opening quote; without it, braces remain literal text.

Practice

Make name, sessions, and minutes_per_session variables. Print a complete sentence using one f-string. Change a value and rerun the script to see the sentence update.

Try another case

If name = "Ava" and minutes = 20, what does print(f"{name}: {minutes} min") display?