The Light Switches of Code

A Boolean (or bool) is the simplest data type in Python. Think of it like a light switch. It can only be one of two things: True (On) or False (Off).

We use Booleans to make decisions in our code, like checking if a user is logged in, or if a game is over.

1. Creating Booleans

# Think of this like answering a Yes/No question
is_raining = True
has_ticket = False
game_over = False

2. The Golden Rule of Booleans

In Python, Booleans are incredibly strict about spelling. You must use a capital T for True and a capital F for False.

# CORRECT
is_active = True

# ERROR! Python will crash.
is_active = true
is_active = TRUE

You also don't use quotation marks for Booleans. If you write "True", Python will think it's just a normal String (text), not a real Boolean switch!

What's Next?

You now know the 3 foundational building blocks of Python: Strings (Words), Numbers (Math), and Booleans (Yes/No). Let's practice using them in the exercises page next!