PCEP Practice Question: Data Types, Variables, Basic I/O and Operators
Which TWO of the following Python data types are mutable?
⚠ Common exam trap
Python Institute often tests the misconception that strings or tuples are mutable because they support indexing and slicing, but candidates must remember that these operations return new objects rather than modifying the original.
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
✓
list
Lists in Python are mutable, meaning their elements can be changed, added, or removed after creation. This is a fundamental property of the list type, which supports operations like append(), extend(), and item assignment.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
list
Why this is correct
Lists can be modified in place.
- ✗
str
Why it's wrong here
Strings are immutable.
- ✗
tuple
Why it's wrong here
Tuple is immutable.
- ✗
int
Why it's wrong here
Integers are immutable.
- ✓
dict
Why this is correct
Dictionaries are mutable.
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