Booleans

True, False, and nothing else

Meet the simplest data type in Python: True or False. Just two options, but incredibly powerful!

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What we are learning

A boolean is a value that can only be True or False. That is it — just two options! But booleans are the foundation of all decision-making in programming. Every if statement checks a boolean.

💡 Think of it like this:

Think of a boolean like a light switch. It is either ON (True) or OFF (False). There is no "kind of on" or "maybe off." Simple, but you use light switches every day!

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Why it matters

Booleans are the language computers use to make decisions. Is the game over? True or False. Is the user logged in? True or False. Every choice a computer makes comes down to a boolean.

Where you see this in real life:

✓Games track whether a level is completed (True/False)
✓Apps check if you are online or offline
✓Security systems check if a door is locked or unlocked

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By the end, you can:

1.Create boolean variables (True and False)
2.Use booleans in if statements
3.Combine booleans with and, or, not

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New words

booleanTrueFalseandornot

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Name three things in your room that are either on or off, true or false. Can you think of something that is NOT a boolean?

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Fun Fact!

Booleans are named after George Boole, a mathematician who invented a whole system of logic using just True and False!

✅ True or False?

A boolean is a value that can only be Trueor False. That is it — just two options! But booleans are the foundation of all decision-making in programming.

Important: In Python, True and False start with capital letters!true(lowercase) will NOT work.

✨ Creating Booleans

🐍Create boolean variables

main.py

● Output

True and False must start with capital letters!

🔗 Combining Booleans

You can combine booleans with three special words:

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and

Both must be True

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At least one True

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not

Flips True/False

🐍Combine booleans with and, or, not

main.py

● Output

Click ▶ Run to see the output!

🧪 Truth Table

Here is how and, or, and not work:

A	B	A and B	A or B	not A
True	True	True	True	False
True	False	False	True	False
False	True	False	True	True
False	False	False	False	True

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Try this: create a boolean called 'likes_pizza' and another called 'likes_broccoli'. Use 'and' to check if someone likes both!

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Quick Quiz!

+10 XP

What is the result of True and False?

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Finished the lesson? Click the button to mark it complete and earn XP!