Free PCEP Using the `else` block in loops Questions and Answers

Question 1

What is the output of the following code?

```python
for i in range(3):
    print(i)
else:
    print('Done!')
```

Accepted Answer

0
1
2
Done!

Answer

0
1
2

Answer

Done!

Answer

A syntax error occurs.

Question 2

What is the output of the following code?

```python
for num in [1, 2, 3, 4]:
    if num == 3:
        break
    print(num)
else:
    print('Finished.')
```

Accepted Answer

1
2

Answer

1
2
Finished.

Answer

1
2
3

Answer

1
2
3
Finished.

Question 3

What is the output of this `while` loop?

```python
i = 5
while i > 0:
    i -= 1
    if i == 2:
        continue
    print(i)
else:
    print('Loop over.')
```

Accepted Answer

4
3
1
0
Loop over.

Answer

4
3
1
0

Answer

4
3
1

Answer

4
3
2
1
0
Loop over.

Question 4

Under which circumstance is the `else` block of a loop NOT executed?

Accepted Answer

When a `break` statement is executed.

Answer

When the loop condition becomes false.

Answer

When a `continue` statement is executed.

Answer

When the loop iterates over an empty sequence.

Question 5

What will be printed to the console?

```python
for char in 'PCEP':
    print(char)
    break
else:
    print('End of string')
```

Accepted Answer

P

Answer

P
C
E
P
End of string

Answer

P
End of string

Answer

End of string

Question 6

Consider the following code. What is the output?

```python
items = []
for item in items:
    print(item)
else:
    print('No items found.')
```

Accepted Answer

No items found.

Answer

An error occurs.

Answer

The program produces no output.

Answer

[]

Question 7

What is the output of this code snippet?

```python
n = 3
while n > 0:
    n -= 1
    print(n)
else:
    if n == 0:
        print('Loop ended.')
```

Accepted Answer

2
1
0
Loop ended.

Answer

3
2
1

Answer

2
1
0

Answer

3
2
1
Loop ended.