The correct answer is to use `re.split(r'(\s+)', s)` because it captures whitespace separators in the regex split, allowing you to reverse only the word components while preserving the exact original spacing, including multiple spaces and tabs. This works by placing the regex pattern in a capturing group, which keeps the delimiters in the resulting list; you then iterate over the list, reversing each non-whitespace element, and join everything back in order. On the Certified Associate Python Programmer PCAP exam, this question tests your understanding of string manipulation and the `re` module’s ability to handle complex splitting—a common trap is using `s.split()` which collapses all whitespace into a single space, losing the original formatting. Remember the memory tip: “Capture the gaps to keep the map”—when you capture the separators in `re.split`, you preserve the whitespace map between words.
PCAP Strings Practice Question
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 is writing a function to reverse each word in a sentence while preserving the original order of the words. For example, 'Hello World' should become 'olleH dlroW'. The current implementation is: def reverse_words(s): return ' '.join(word[::-1] for word in s.split()). This works for simple cases. However, the input may contain multiple spaces between words (e.g., 'Hello World') and tabs. The requirement is to preserve the exact whitespace between words (including tabs and multiple spaces) in the output. Which of the following modifications will achieve this while keeping the approach efficient?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use re.split(r'(\s+)', s) to separate words and whitespace, then reverse the word parts and join back
To preserve whitespace, we need to split using a regex that captures the separators, then reverse each word and rejoin. Option C does this: re.split(r'(\s+)', s) splits and keeps the separators, making it easy to reverse non-whitespace parts. Option A loses the exact spacing. Option B does not preserve tabs. Option D is a manual loop that is error-prone.
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.
✗
Use s.split(' ') and handle empty strings to preserve spaces, but ignore tabs
Why it's wrong here
Tabs will be lost or treated as spaces.
✗
Iterate over the string, detect word boundaries, and build a new string manually
Why it's wrong here
Complex and error-prone; not efficient.
✓
Use re.split(r'(\s+)', s) to separate words and whitespace, then reverse the word parts and join back
Why this is correct
Preserves all whitespace exactly by keeping the separators.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use s.split() and then join with the original spaces using a separate loop that tracks whitespace
Why it's wrong here
Does not preserve the number of spaces or tabs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 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
Got this wrong? Here's your next step.
Identify which PCAP exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Strings — This question tests Strings — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use re.split(r'(\s+)', s) to separate words and whitespace, then reverse the word parts and join back — To preserve whitespace, we need to split using a regex that captures the separators, then reverse each word and rejoin. Option C does this: re.split(r'(\s+)', s) splits and keeps the separators, making it easy to reverse non-whitespace parts. Option A loses the exact spacing. Option B does not preserve tabs. Option D is a manual loop that is error-prone.
What should I do if I get this PCAP question wrong?
Identify which PCAP exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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.
Question Discussion
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