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

loop ended after

Answer

loop ended

Answer

Nothing

Question 2

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

Accepted Answer

No break statement terminated the loop

Answer

The loop body raised a StopIteration

Answer

Any exception is caught inside the loop

Answer

The loop variable equals None at the end

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

all small checked

Answer

all small

Answer

Error

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

No, you must choose one or the other

Answer

Yes, but the else will not run if an exception is caught

Answer

No, it causes a SyntaxError

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

2 4

Answer

done

Answer

1 3 5 done

Question 6

Which of the following is TRUE about the loop `else` clause?

Accepted Answer

It runs after every complete loop, whether the iterable was empty or not

Answer

It only runs when the loop body executed at least once

Answer

It runs after break exits the loop

Answer

It is only valid for while loops, not for loops

Question 7

What is the output of this code?

for i in range(3):
    for j in range(3):
        if i + j == 4:
            break
else:
    print('outer done')

Accepted Answer

outer done

Answer

Nothing

Answer

Error

Answer

outer done outer done outer done