Quick Answer
The correct answer is `s = s.strip()`. This method works because `strip()` is specifically designed to remove all leading and trailing whitespace characters—including spaces, tabs, and newlines—from a string while preserving any internal spaces, exactly as the requirement states. On the Certified Associate Python Programmer PCAP exam, this question tests your understanding of string methods and the distinction between boundary and internal whitespace manipulation, often appearing alongside `lstrip()` and `rstrip()` as distractors. A common trap is confusing `strip()` with `replace()` or `split()`, which would alter internal content. Remember the memory tip: "strip strips the sides, not the middle"—just like peeling the crust off a sandwich while keeping the filling intact.
This PCAP practice question tests your understanding of strings. 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 developer wants to remove all leading and trailing whitespace from a string, but preserve internal spaces. Which line of code accomplishes this?
s = s.lstrip()
Why wrong: Only removes leading whitespace.
s = s.strip().lstrip()
Why wrong: Redundant; strip() already removes both sides.
s = s.replace(' ', '')
Why wrong: Removes all spaces, including internal ones.
s = s.strip()
Removes leading and trailing whitespace only.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
s = s.strip()
Option D is correct because `s.strip()` removes all leading and trailing whitespace characters (spaces, tabs, newlines) from the string while preserving internal spaces. This is the exact requirement: eliminate whitespace at the boundaries only, leaving the internal content unchanged.
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.
s = s.lstrip()
Why it's wrong here
Only removes leading whitespace.
s = s.strip().lstrip()
Why it's wrong here
Redundant; strip() already removes both sides.
s = s.replace(' ', '')
Why it's wrong here
Removes all spaces, including internal ones.
s = s.strip()
Why this is correct
Removes leading and trailing whitespace only.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Python Institute often tests the distinction between `strip()`, `lstrip()`, and `rstrip()`, and the trap here is that candidates may confuse `strip()` with `replace(' ', '')` or think that `lstrip()` alone is sufficient, failing to recognize that `strip()` handles both ends in one call.
Detailed technical explanation
The `strip()` method in Python removes all whitespace characters (as defined by Unicode's `isspace()` check, including spaces, tabs, newlines, carriage returns, formfeeds, and vertical tabs) from both ends of the string. Under the hood, it iterates from the start and end of the string, skipping any characters where `char.isspace()` is True, then returns the remaining substring. In real-world scenarios like cleaning user input from a form or parsing log files, `strip()` is essential to remove accidental whitespace without altering meaningful spaces within the data.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
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FAQ
Strings — This question tests Strings — Read the scenario before looking for a memorised answer..
The correct answer is: s = s.strip() — Option D is correct because `s.strip()` removes all leading and trailing whitespace characters (spaces, tabs, newlines) from the string while preserving internal spaces. This is the exact requirement: eliminate whitespace at the boundaries only, leaving the internal content unchanged.
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 PCAP 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 PCAP exam.
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