Quick Answer
The answer is `list((1, 2, 3))`, `[1, 2, 3]`, and `[1, 2, 3,]`. These are all valid ways to create a list in Python because the `list()` constructor accepts any iterable, such as a tuple, while square brackets define a list literal, and Python explicitly permits an optional trailing comma after the last element inside those brackets. On the Certified Entry-Level Python Programmer PCEP exam, this question tests your understanding of list creation syntax and the often-overlooked trailing comma rule—a common trap where test-takers mistakenly think a comma after the final element causes an error. Remember that Python’s flexibility with trailing commas is intentional, making it easier to add or remove items without breaking syntax. A useful memory tip: think of the trailing comma as a “future-friendly” placeholder—Python ignores it, so `[1, 2, 3,]` is just as valid as `[1, 2, 3]`.
This PCEP practice question tests your understanding of computer programming and python fundamentals. 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.
Which THREE of the following are valid ways to create a list with elements 1, 2, 3? (Choose three.)
[1, 2, 3,]
Trailing comma allowed.
list(range(1, 4))
Converts range to list.
[1, 2, 3]
Direct list literal.
list(1, 2, 3)
Why wrong: list() takes a single iterable.
list((1, 2, 3))
Converts tuple to list.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
[1, 2, 3,]
Option A is correct because Python allows an optional trailing comma after the last element in a list literal, so `[1, 2, 3,]` is syntactically valid and creates the list `[1, 2, 3]`. This is a common feature in Python that helps with version control diffs when adding or removing elements.
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.
[1, 2, 3,]
Why this is correct
Trailing comma allowed.
Related concept
Read the scenario before looking for a memorised answer.
list(range(1, 4))
Why this is correct
Converts range to list.
Related concept
Read the scenario before looking for a memorised answer.
[1, 2, 3]
Why this is correct
Direct list literal.
Related concept
Read the scenario before looking for a memorised answer.
list(1, 2, 3)
Why it's wrong here
list() takes a single iterable.
list((1, 2, 3))
Why this is correct
Converts tuple to list.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Python Institute often tests the distinction between the `list()` constructor requiring a single iterable argument versus the mistaken belief that it accepts multiple positional arguments, as in option D.
Detailed technical explanation
The `list()` constructor can take any iterable (e.g., a tuple, string, or range object) and converts it into a list. For example, `list(range(1, 4))` works because `range` returns an iterable that yields 1, 2, 3. The trailing comma in a list literal is a syntactic convenience that does not affect the resulting list object; it is especially useful in multi-line lists to avoid syntax errors when adding or removing items.
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
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FAQ
Computer Programming and Python Fundamentals — This question tests Computer Programming and Python Fundamentals — Read the scenario before looking for a memorised answer..
The correct answer is: [1, 2, 3,] — Option A is correct because Python allows an optional trailing comma after the last element in a list literal, so `[1, 2, 3,]` is syntactically valid and creates the list `[1, 2, 3]`. This is a common feature in Python that helps with version control diffs when adding or removing elements.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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