PCEP Control Flow, Loops, Lists and Logic Practice Question
This PCEP practice question tests your understanding of control flow, loops, lists and logic. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A developer is troubleshooting a loop that terminates earlier than expected. The code is: i = 0; while i < 5: if i == 3: break; print(i); i += 1. What is the output?
Why wrong: Break before print? Actually print is before break? In code: if i==3: break; print(i) is after? Wait code: if i == 3: break; print(i); i += 1. So for i=3, break is executed before print, so 3 not printed.
C
0 1
Why wrong: i=2 prints, then i becomes 3, break before print? Actually i increments after print? i+=1 after print, so for i=2, print then i becomes 3, then next iteration i=3, break, so prints 0,1,2.
D
0 1 2
Correct: i increments to 3, break exits loop, so only 0,1,2 printed.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
0 1 2
The loop starts with i=0 and increments i by 1 each iteration. When i reaches 3, the break statement executes, immediately terminating the loop. Therefore, only i values 0, 1, and 2 are printed, making option D correct.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
0 1 2 3 4
Why it's wrong here
This would happen without break.
✗
0 1 2 3
Why it's wrong here
Break before print? Actually print is before break? In code: if i==3: break; print(i) is after? Wait code: if i == 3: break; print(i); i += 1. So for i=3, break is executed before print, so 3 not printed.
✗
0 1
Why it's wrong here
i=2 prints, then i becomes 3, break before print? Actually i increments after print? i+=1 after print, so for i=2, print then i becomes 3, then next iteration i=3, break, so prints 0,1,2.
✓
0 1 2
Why this is correct
Correct: i increments to 3, break exits loop, so only 0,1,2 printed.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often mistakenly think the break happens after printing the value that triggers it (i==3), rather than before the print statement in the same iteration.
Detailed technical explanation
How to think about this question
The break statement in Python immediately exits the innermost enclosing loop, skipping any remaining code in the current iteration (including the print(i) and i += 1 statements). This is a common pattern for early termination based on a condition, and understanding the exact point of execution where break occurs is critical for debugging loop behavior.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Control Flow, Loops, Lists and Logic — This question tests Control Flow, Loops, Lists and Logic — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 0 1 2 — The loop starts with i=0 and increments i by 1 each iteration. When i reaches 3, the break statement executes, immediately terminating the loop. Therefore, only i values 0, 1, and 2 are printed, making option D correct.
What should I do if I get this PCEP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This PCEP practice question is part of Courseiva's free Python Institute certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCEP exam.
Question Discussion
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