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.
Which two of the following list methods modify the original list in place? (Choose two.)
sort()
Sorts the list in place.
count()
Why wrong: Returns count of elements, does not modify.
sorted()
Why wrong: Returns a new sorted list, does not modify original.
append()
Modifies the list by adding an element.
copy()
Why wrong: Returns a shallow copy, does not modify original.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
sort()
A is correct because the `sort()` method sorts the list in place, meaning it modifies the original list object without creating a new one. D is correct because `append()` adds an element to the end of the list, directly mutating the original list.
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.
sort()
Why this is correct
Sorts the list in place.
Related concept
Read the scenario before looking for a memorised answer.
count()
Why it's wrong here
Returns count of elements, does not modify.
sorted()
Why it's wrong here
Returns a new sorted list, does not modify original.
append()
Why this is correct
Modifies the list by adding an element.
Related concept
Read the scenario before looking for a memorised answer.
copy()
Why it's wrong here
Returns a shallow copy, does not modify original.
Common exam traps
Python Institute often tests the distinction between methods that mutate the list in place (like `sort()`) and functions that return a new list (like `sorted()`), as well as the fact that `count()` and `copy()` are non-mutating, to see if candidates confuse method behavior with function behavior.
Detailed technical explanation
In Python, list methods that modify the list in place (like `sort()`, `append()`, `extend()`, `insert()`, `remove()`, `pop()`, `reverse()`) return `None` to emphasize that they mutate the object. This contrasts with functions like `sorted()` which return a new list object. Understanding this distinction is crucial for avoiding unintended side effects when passing lists to functions or working with references.
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
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: sort() — A is correct because the `sort()` method sorts the list in place, meaning it modifies the original list object without creating a new one. D is correct because `append()` adds an element to the end of the list, directly mutating the original list.
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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