while True pattern in Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of a simple while True loop with break

What is the output of this code?

Python

count = 0
while True:
    print(count)
    count += 1
    if count == 3:
        break

A

0
1
2
3
4

B

0
1
2
3

C

1
2
3

D

0
1
2

💡 Hint

The loop stops when count reaches 3, so it prints before breaking.

The loop starts at 0 and prints count each time. When count becomes 3, the break stops the loop before printing 3.

❓ Predict Output

intermediate

While True loop with continue and break

What is the output of this code?

Python

i = 0
while True:
    i += 1
    if i == 2:
        continue
    if i == 4:
        break
    print(i)

A

1
2
3

B

1
3

C

1
3
4

D

2
3

💡 Hint

The continue skips printing when i is 2.

When i is 2, continue skips the print. The loop breaks at i == 4, so 4 is not printed. Only 1 and 3 are printed.

🔧 Debug

advanced

Identify the error in this while True loop

What error does this code raise when run?

Python

while True
    print("Hello")
    break

A SyntaxError

B IndentationError

C NameError

D No error, prints Hello once

💡 Hint

Check the syntax of the while statement.

The while statement is missing a colon at the end, causing a SyntaxError.

❓ Predict Output

advanced

Output of nested while True loops with break

What is the output of this code?

Python

x = 0
while True:
    y = 0
    while True:
        print(f"{x},{y}")
        y += 1
        if y == 2:
            break
    x += 1
    if x == 3:
        break

A

0,0
1,0
2,0

B

0,0
0,1
0,2
1,0
1,1
2,0
2,1

C

0,0
0,1
1,0
1,1
2,0
2,1

D

0,0
0,1
1,0
1,1
2,0

💡 Hint

Inner loop runs twice for each outer loop iteration.

The inner loop prints y from 0 to 1, then breaks. The outer loop runs x from 0 to 2, then breaks.

🧠 Conceptual

expert

Why use while True with break instead of a condition?

Which is the best reason to use a while True loop with a break inside instead of a while loop with a condition?

A To handle complex exit conditions inside the loop body more clearly

B To create an infinite loop that never stops

C Because while True loops run faster than while with conditions

D To avoid indentation errors

💡 Hint

Think about readability and control inside the loop.

Using while True with break allows placing multiple exit points inside the loop, making complex conditions easier to manage.