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.
Which TWO of the following string methods return a boolean value?
startswith()
Returns True or False.
capitalize()
Why wrong: Returns a copy of the string with first character capitalized.
format()
Why wrong: Returns a formatted string.
swapcase()
Why wrong: Returns a new string with case swapped.
isalpha()
Returns True or False.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
startswith()
The `startswith()` method returns `True` if the string starts with the specified prefix, otherwise `False`. Similarly, `isalpha()` returns `True` if all characters in the string are alphabetic and there is at least one character, otherwise `False`. Both methods explicitly return a boolean value (`True` or `False`), making them correct choices.
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.
startswith()
Why this is correct
Returns True or False.
Related concept
Read the scenario before looking for a memorised answer.
capitalize()
Why it's wrong here
Returns a copy of the string with first character capitalized.
format()
Why it's wrong here
Returns a formatted string.
swapcase()
Why it's wrong here
Returns a new string with case swapped.
isalpha()
Why this is correct
Returns True or False.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse methods that return a new string (like `capitalize()`, `swapcase()`) with methods that return a boolean, because both are called on string objects and appear similar in syntax.
Detailed technical explanation
Under the hood, `startswith()` uses an efficient prefix check (often via `strncmp` in C) and can accept a tuple of prefixes for multiple checks, while `isalpha()` relies on Unicode character category checks (e.g., `L` category in Python's unicodedata). A subtle behavior: `isalpha()` returns `False` for empty strings, which can catch developers off guard when validating user input. In real-world scenarios, these methods are commonly used in input validation pipelines (e.g., checking if a filename starts with a valid prefix or if a field contains only letters).
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: startswith() — The `startswith()` method returns `True` if the string starts with the specified prefix, otherwise `False`. Similarly, `isalpha()` returns `True` if all characters in the string are alphabetic and there is at least one character, otherwise `False`. Both methods explicitly return a boolean value (`True` or `False`), making them correct choices.
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 24, 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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