If statement execution flow in Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does an if statement do in Python?

It checks a condition and runs a block of code only if that condition is true.

beginner

What happens if the if condition is false and there is no else block?

The program skips the if block and continues with the next code after it.

intermediate

How does an elif statement work in an if-elif-else chain?

It checks its condition only if all previous if and elif conditions were false.

beginner

What is the role of the else block in an if statement?

It runs a block of code when all previous if and elif conditions are false.

beginner

Consider this code:<br>

if x > 10:
  print('Big')
elif x > 5:
  print('Medium')
else:
  print('Small')

<br>What will print if x = 7?

It will print Medium because x > 10 is false but x > 5 is true.

What happens when the if condition is true?

A The code inside the <code>if</code> block runs.

B The code inside the <code>else</code> block runs.

C The program stops.

D The code inside the <code>elif</code> block runs.

When the if condition is true, only the code inside the if block runs.

If all if and elif conditions are false, which block runs?

A <code>if</code> block

B No block runs

C <code>elif</code> block

D <code>else</code> block

The else block runs when all previous conditions are false.

Can an if statement have multiple else blocks?

A Yes, as many as you want.

B No, only one <code>else</code> block is allowed.

C Only if you use <code>elif</code>.

D Only if the conditions are true.

An if statement can have only one else block.

What does the elif keyword mean?

A It ends the if statement.

B Else, it runs if all conditions are true.

C Else if, it checks another condition if previous ones are false.

D It repeats the if block.

elif means 'else if' and checks a new condition only if previous conditions were false.

What will this code print if score = 85?<br>

if score >= 90:
  print('A')
elif score >= 80:
  print('B')
else:
  print('C')

A B

B A

C C

D Nothing

Since 85 is not >= 90 but is >= 80, it prints 'B'.

Explain how Python decides which block of code to run in an if-elif-else statement.

Think about the order Python checks conditions.

Describe what happens when an if condition is false and there is no else block.

What does the program do next?