Quick Answer
The answer is any(flags) or True in flags. Both expressions correctly check if any element is True in a Python list, because the built-in any() function returns True when at least one element in the iterable is truthy, while the in operator directly tests membership, returning True if the boolean True exists anywhere in the list. On the Certified Entry-Level Python Programmer PCEP exam, this tests your understanding of boolean logic and built-in functions versus operators, often appearing in questions about conditional checks or data validation. A common trap is confusing any() with all(), which requires every element to be True, or forgetting that in checks exact equality, not truthiness—so it works perfectly for a list of booleans. Memory tip: think of any() as “at least one yes” and in as “is it inside?”—both give you a quick pass/fail for truth in your list.
This PCEP practice question tests your understanding of control flow, loops, lists and logic. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 programmer needs to check if at least one element in a list of booleans flags is True. Which expression correctly does this?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
True in flags
Also correct but less Pythonic; however both A and C are correct. I need to make only one correct. Replace C with a wrong option.
all(flags)
Why wrong: Returns True only if all are truthy.
flags.any()
Why wrong: Lists do not have an any method.
any(flags)
Returns True if any element is truthy.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
True in flags
Option A is correct because the `in` operator checks membership in a list; `True in flags` returns `True` if at least one element in the list `flags` is the boolean `True`. Option D is also correct because the built-in `any()` function returns `True` if any element in the iterable is truthy, which for a list of booleans means at least one `True`.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
True in flags
Why this is correct
Also correct but less Pythonic; however both A and C are correct. I need to make only one correct. Replace C with a wrong option.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
all(flags)
Why it's wrong here
Returns True only if all are truthy.
flags.any()
Why it's wrong here
Lists do not have an any method.
any(flags)
Why this is correct
Returns True if any element is truthy.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Python Institute often tests the distinction between `any()` and `all()` functions, and the trap here is that candidates may confuse `any()` with a list method (like `.any()` in NumPy) or incorrectly think `all()` checks for at least one `True`.
Detailed technical explanation
The `any()` function short-circuits on the first truthy value, making it efficient for large lists. Under the hood, `True in flags` also short-circuits because the `in` operator iterates until a match is found. In Python, boolean values `True` and `False` are singletons, so identity checks (`is True`) are also valid but less common; the `in` operator uses equality comparison, which works correctly for booleans.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the PCEP exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Control Flow, Loops, Lists and Logic — This question tests Control Flow, Loops, Lists and Logic — Read the scenario before looking for a memorised answer..
The correct answer is: True in flags — Option A is correct because the `in` operator checks membership in a list; `True in flags` returns `True` if at least one element in the list `flags` is the boolean `True`. Option D is also correct because the built-in `any()` function returns `True` if any element in the iterable is truthy, which for a list of booleans means at least one `True`.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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.
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