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Lesson 15 of 20 · Conditionals
Conditionals — Part 4
If–else: make decisions based on conditions. This is part 4 of 20.
What you'll learn
You will learn how if/else lets code make decisions based on whether something is true or false.
Steps
- 1Read the code. x is set to True. The 'if x:' line checks: is x true? Since it is, the code prints 'Yes!'
- 2The 'else' block only runs when the condition is NOT true. Since x IS True, the 'No!' line gets skipped entirely.
- 3If x were False instead, the computer would skip 'Yes!' and print 'No!' instead. One condition, two possible paths!
- 4Conditions let programs make decisions — like a fork in the road. 'if' goes one way, 'else' goes the other.
Key Terms
- Condition
- A check that can be true or false. The program chooses what to do based on it.
- if
- A keyword that means 'when this is true, do this block of code.'
- else
- A keyword that means 'otherwise, when the if is not true, do this block instead.'
Python 3
Output
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