Match each Python data structure to its characteristic.
Drag a concept onto its matching description — or click a concept then click the description.
Ordered, immutable sequence of items
Unordered collection of unique items
Mapping of key-value pairs
Ordered, mutable sequence of items
Immutable sequence of characters
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
List: mutable, ordered, allows duplicates
Python data structures have distinct properties: lists and tuples are ordered sequences (lists mutable, tuples immutable); sets are unordered and contain unique elements; dictionaries map keys to values. Common confusions include mixing mutability/order between lists and tuples, and assuming sets maintain order.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
List: mutable, ordered, allows duplicates
Why this is correct
Lists are mutable sequences that maintain insertion order and allow duplicate values.
Tuple: immutable, ordered, allows duplicates
Why this is correct
Tuples are immutable sequences that maintain order and can contain duplicates.
Set: mutable, unordered, no duplicates
Why this is correct
Sets are mutable collections that are unordered (no index) and enforce uniqueness of elements.
Dictionary: mutable mapping with key-value pairs
Why this is correct
Dictionaries store data in key-value pairs, are mutable, and (as of Python 3.7) maintain insertion order.
List: immutable and ordered
Why it's wrong here
Incorrect — lists are mutable, not immutable. This describes a tuple.
Set: ordered collection of elements
Why it's wrong here
Incorrect — sets are unordered. Ordered collections are lists or tuples.
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About these practice questions
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This PCEP 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 PCEP exam.