Lesson 2 of 20 · Logic

Logic — Part 2

Boolean expressions in depth.

What you'll learn

You will learn that comparisons produce True or False (booleans), and these power every decision in code.

Words to know

Boolean: A value that is either True or False.
Compare: Checking how two values relate: equal (==), greater (>), less (<).
Condition: Something that is true or false. Programs use conditions to make decisions.

Your turn

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Try it: run the code, then change it

1Computers think in True and False. a > 3 asks 'is 5 greater than 3?' — yes, so it's True.
2a > 10 asks 'is 5 greater than 10?' — no, so it's False. These True/False values are called booleans.
3Other comparisons: == (equal?), != (not equal?), < (less than?), >= (greater or equal?). They all give True or False.
4Booleans power every decision in code. Every 'if' statement checks a boolean. Every game checks: is the player alive? True or False!

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Output

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What does == mean in Python?

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2 == 3 is:

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10 < 20 is:

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What is a boolean?

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5 > 3 is:

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