Nested conditional execution in Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is nested conditional execution in Python?

Nested conditional execution means putting one if-else statement inside another if or else block. It helps check multiple conditions step-by-step.

beginner

How do you write a nested if statement in Python?

You write an if statement inside another if or else block, like:<br>

if condition1:
    if condition2:
        # code here

beginner

Why use nested conditional execution?

It helps check detailed conditions in order. For example, first check if a person is adult, then check if they have a driving license.

beginner

What happens if the outer condition in nested if is False?

The inner if statements are skipped completely because the outer condition controls if the inner code runs.

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Example: What will this code print?<br>

age = 20
if age >= 18:
    if age >= 21:
        print('Adult and can drink')
    else:
        print('Adult but cannot drink')
else:
    print('Not an adult')

It will print: Adult but cannot drink because age is 20, which is >= 18 but less than 21.

What does nested conditional execution allow you to do?

A Run code without any condition

B Write only one condition

C Skip all conditions

D Check multiple conditions inside each other

Nested conditional execution lets you check one condition inside another to handle complex decisions.

In nested if statements, when does the inner if run?

A Only if the outer if condition is True

B Always, no matter what

C Only if the outer if condition is False

D Never

The inner if runs only if the outer if condition is True, because it is inside that block.

What will this code print?<br>

score = 85
if score >= 90:
    print('A grade')
else:
    if score >= 80:
        print('B grade')
    else:
        print('C grade')

A A grade

B B grade

C C grade

D No output

Score is 85, so outer if is False, inner if is True, so it prints 'B grade'.

Which keyword is NOT used in nested conditional execution?

A for

B else

C elif

D if

'for' is a loop keyword, not used for conditional execution.

What is the main benefit of using nested conditionals?

A Avoid using else statements

B Make code run faster

C Simplify checking multiple related conditions stepwise

D Write fewer lines of code

Nested conditionals help check related conditions one after another clearly.

Explain nested conditional execution and give a simple example.

Think about checking one condition inside another.

Describe how the flow of execution works in nested if statements.

Imagine opening boxes inside boxes only if the first box is open.