PCEP Computer Programming and Python Fundamentals Practice Question
Which of the following is an immutable data type in Python?
⚠ Common exam trap
Python Institute often tests the misconception that 'immutable' means the variable cannot be reassigned, when in fact it means the object's contents cannot be changed — a common trap that leads candidates to incorrectly label strings or tuples as mutable.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
tuple
A tuple is immutable because once created, its elements cannot be changed, added, or removed. This is enforced by Python's internal structure: tuples are stored as a fixed-length array of object references, and no methods exist to modify them in place.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
tuple
Why this is correct
Tuples are immutable.
- ✗
set
Why it's wrong here
Sets are mutable.
- ✗
list
Why it's wrong here
Lists are mutable; you can change, add, or remove elements.
- ✗
dict
Why it's wrong here
Dictionaries are mutable.
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