PCEP Computer Programming and Python Fundamentals Practice Question

A developer is writing a script to process user input. The script should repeatedly ask for a number until a valid integer is entered. Which loop structure is most appropriate?

⚠ Common exam trap

The PCEP exam often tests the misconception that a for loop can handle indefinite repetition by using a large range, but the trap is that for loops are designed for definite iteration over a sequence, not for conditions that depend on runtime input validation.

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

while loop with a condition

A while loop with a condition is the most appropriate because it allows the script to repeatedly prompt for input until a valid integer is entered, checking the condition before each iteration. In Python, the while loop continues as long as the condition evaluates to True, making it ideal for indefinite iteration where the number of repetitions is unknown beforehand. This pattern is commonly used with a try-except block to validate integer conversion.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
while loop with a condition
Why this is correct
A while loop can run until a condition is met, ideal for input validation.
✗
for loop
Why it's wrong here
For loops are designed for iterating over a known sequence, not for indefinite repetition.
✗
do-while loop
Why it's wrong here
Python does not have a do-while loop.
✗
Recursion
Why it's wrong here
Recursion could be used but is not typical and risks stack overflow.

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PCEP Computer Programming and Python Fundamentals Practice Question

Why each option matters

Option-by-option breakdown

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