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 THREE of the following are true about Python strings?
They support slicing.
Substrings can be obtained using slice notation.
They are stored as arrays of ASCII characters.
Why wrong: Python 3 strings are Unicode, not ASCII.
They can be concatenated with the + operator.
Concatenation is a fundamental operation.
They are mutable.
Why wrong: Strings are immutable.
They support indexing.
Individual characters can be accessed via index.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
They support slicing.
Option A is correct because Python strings are sequences, and the slicing syntax (e.g., s[start:stop:step]) allows extracting substrings by specifying indices. This works because strings implement the sequence protocol, including __getitem__ with slice objects.
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.
They support slicing.
Why this is correct
Substrings can be obtained using slice notation.
Related concept
Read the scenario before looking for a memorised answer.
They are stored as arrays of ASCII characters.
Why it's wrong here
Python 3 strings are Unicode, not ASCII.
They can be concatenated with the + operator.
Why this is correct
Concatenation is a fundamental operation.
Related concept
Read the scenario before looking for a memorised answer.
They are mutable.
Why it's wrong here
Strings are immutable.
They support indexing.
Why this is correct
Individual characters can be accessed via index.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Python Institute often tests the immutability of strings by presenting operations that appear to modify them in place, leading candidates to incorrectly select 'mutable' because they confuse string methods (like .replace() or .upper()) with in-place mutation.
Detailed technical explanation
Internally, CPython uses a compact representation (PyASCIIObject or PyCompactUnicodeObject) that stores the string data in a single contiguous block, with the encoding chosen based on the maximum ordinal value. Slicing does not copy the underlying data but creates a new string object that references the same memory (if possible) via a technique called 'interning' for small strings, though slices of larger strings may trigger a copy. This immutability allows strings to be used as dictionary keys and ensures hash consistency.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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FAQ
Strings — This question tests Strings — Read the scenario before looking for a memorised answer..
The correct answer is: They support slicing. — Option A is correct because Python strings are sequences, and the slicing syntax (e.g., s[start:stop:step]) allows extracting substrings by specifying indices. This works because strings implement the sequence protocol, including __getitem__ with slice objects.
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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