PCEP Computer Programming and Python Fundamentals Practice Question
Which two of the following are true about Python lists? (Choose two.)
⚠ Common exam trap
The traps here include confusing list mutability with immutability, assuming indexing starts from 1, and mistakenly believing lists can be used as dictionary keys.
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
✓
Lists can contain elements of different data types.
Only two options are correct: A and E. Option A is correct because Python lists can contain elements of different data types. Option E is correct because len() returns the number of elements in a list. Options B, C, D are incorrect: B is wrong because lists are mutable and unhashable, hence cannot be dictionary keys; C is wrong because index starts at 0; D is wrong because lists are mutable.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Lists can contain elements of different data types.
Why this is correct
Correct. Python lists are heterogeneous containers; they can store elements of different data types.
- ✗
Lists can be used as dictionary keys.
Why it's wrong here
Incorrect. Lists are mutable and unhashable, so they cannot be used as dictionary keys.
- ✗
Lists are indexed starting from 1.
Why it's wrong here
Incorrect. List indexing starts at 0, not 1.
- ✗
Lists are immutable.
Why it's wrong here
Incorrect. Lists are mutable; their elements can be changed after creation.
- ✓
The len() function returns the number of elements.
Why this is correct
Correct. The len() function returns the number of elements in a list.
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