PCEP Using the `else` block in loops 3

Question 1

Which use case is the `else` clause on a loop MOST commonly used for in Python?

Accepted Answer

Detecting that a search completed without finding a target

Answer

The loop else pattern is idiomatically used to run code only when a target was not found (i.e., break was never triggered).

Question 2

What is printed?

for i in range(1, 4):
    print(i)
else:
    print('end')

Accepted Answer

1 2 3 end

Answer

The loop prints 1, 2, 3 normally and then the else block prints 'end' since no break occurred.

Question 3

Does `continue` prevent the `else` block of a loop from executing?

Accepted Answer

No, continue does not affect the else block

Answer

continue only skips the current iteration's remaining body; it does not exit the loop, so the else block still executes normally.

Question 4

What output does this produce?

found = False
for x in range(5):
    if x == 3:
        found = True
        break
else:
    print('not found')
if found:
    print('found')

Accepted Answer

found

Answer

x==3 triggers break, so else is skipped, found is True, and 'found' is printed.

Question 5

How many times does the else block execute in a loop that runs to completion?

Accepted Answer

Exactly once, after the loop finishes

Answer

The else block of a loop executes exactly once after the loop body finishes all iterations naturally.

(PCEP) Certified Entry-Level Python Programmer Practice Test