Elif ladder execution in Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an elif ladder in Python?

An elif ladder is a way to check multiple conditions one after another. It lets the program choose only one block of code to run based on the first true condition.

beginner

How does Python decide which block to execute in an elif ladder?

Python checks each condition from top to bottom. It runs the code for the first condition that is true and skips the rest.

beginner

What happens if none of the if or elif conditions are true and there is an else block?

The else block runs as a default when all previous conditions are false.

beginner

Can multiple elif blocks run in one if-elif-else ladder?

No. Only the first true condition's block runs. After that, Python skips the rest.

beginner

Write a simple if-elif-else ladder to print 'Cold', 'Warm', or 'Hot' based on temperature variable.

Example:<br>

temp = 30
if temp < 15:
    print('Cold')
elif temp < 25:
    print('Warm')
else:
    print('Hot')

In an if-elif-else ladder, what happens if the first if condition is true?

A The <code>else</code> block runs too.

B All <code>elif</code> blocks run after the <code>if</code> block.

C Only the <code>if</code> block runs, and the rest are skipped.

D The program checks all conditions before running any block.

Python runs only the first true condition's block and skips the rest.

What keyword is used to check multiple conditions after an if in Python?

A elif

B else

C switch

D case

elif is used to check additional conditions after if.

If none of the if or elif conditions are true, which block runs?

A The <code>else</code> block

B The last <code>elif</code> block

C The first <code>if</code> block

D No block runs

The else block runs when all previous conditions are false.

Can more than one elif block run in a single if-elif-else ladder?

A Yes, all true <code>elif</code> blocks run.

B No, only the first true condition's block runs.

C Only the last <code>elif</code> runs.

D Only the <code>else</code> block runs.

Only the first true condition's block runs; the rest are skipped.

What will this code print?<br>

temp = 20
if temp < 15:
    print('Cold')
elif temp < 25:
    print('Warm')
else:
    print('Hot')

A Cold

B Nothing

C Hot

D Warm

Since 20 is less than 25 but not less than 15, it prints 'Warm'.

Explain how Python executes an if-elif-else ladder step by step.

Think about the order and how Python stops checking after one true condition.

Write a simple example using an if-elif-else ladder to categorize a number as 'negative', 'zero', or 'positive'.

Use comparisons like &lt; 0 and == 0.