PCEP Using the `else` block in loops 5

Question 1

What is the output of this code?

x = 5
while x > 0:
    x -= 1
    if x == 2:
        break
else:
    print('loop ended')
print('after')

Accepted Answer

after

Answer

x reaches 2 and break fires, skipping the else, so only 'after' is printed.

Question 2

The `else` block of a loop is executed when:

Accepted Answer

No break statement terminated the loop

Answer

The else block runs whenever the loop exits without a break, regardless of whether the body ran zero or many times.

Question 3

What does this code print?

primes = [2, 3, 5]
for p in primes:
    if p > 4:
        break
else:
    print('all small')
print('checked')

Accepted Answer

checked

Answer

p==5 satisfies p>4, triggering break, so the else is skipped and only 'checked' is printed.

Question 4

Can an `else` block on a loop be combined with a `try/except` inside the loop body?

Accepted Answer

Yes, they are independent constructs

Answer

A try/except inside the loop body and a loop else block are completely independent; catching an exception does not affect the else clause.

Question 5

What is the output?

for i in range(1, 6):
    if i % 2 == 0:
        print(i)
else:
    print('done')

Accepted Answer

2 4 done

Answer

The loop prints even numbers 2 and 4, then the else block prints 'done' since no break occurred.

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