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 needs to check if a filename starts with the prefix 'report_'. Which string method should be used?
prefix()
Why wrong: prefix() is not a valid string method.
startswith()
Correct because str.startswith(prefix) checks the start of the string.
starts()
Why wrong: starts() is not a valid string method.
beginwith()
Why wrong: beginwith() is not a valid Python string method.
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 is the correct string method in Python to check if a string begins with a specified prefix. It returns `True` if the string starts with the given substring, otherwise `False`, making it the exact tool for checking if a filename starts with 'report_'.
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.
prefix()
Why it's wrong here
prefix() is not a valid string method.
startswith()
Why this is correct
Correct because str.startswith(prefix) checks the start of the string.
Related concept
Read the scenario before looking for a memorised answer.
starts()
Why it's wrong here
starts() is not a valid string method.
beginwith()
Why it's wrong here
beginwith() is not a valid Python string method.
Common exam traps
Python Institute often tests the exact naming of Python string methods, and the trap here is that candidates may confuse `startswith()` with similar-sounding but non-existent methods like `starts()` or `beginwith()`, or incorrectly assume a method like `prefix()` exists based on other programming languages.
Detailed technical explanation
The `str.startswith(prefix[, start[, end]])` method can accept a tuple of prefixes to check multiple possibilities, and optional `start` and `end` parameters to limit the search within a slice of the string. This is particularly useful in real-world scenarios like validating file extensions or URL patterns, where you might need to check against several allowed prefixes efficiently.
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 is the correct string method in Python to check if a string begins with a specified prefix. It returns `True` if the string starts with the given substring, otherwise `False`, making it the exact tool for checking if a filename starts with 'report_'.
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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