PCAP Object-Oriented Programming Practice Question
This PCAP practice question tests your understanding of object-oriented programming. 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 statements about the Python method resolution order (MRO) are true? (Select exactly 3.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The MRO of a class can be viewed using the __mro__ attribute.
Option B is correct because the `__mro__` attribute on a class returns a tuple of classes in the exact order that Python uses to resolve methods and attributes. This attribute is computed at class definition time using the C3 linearization algorithm, and it provides a direct, read-only view of the resolution order for that class.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The MRO is determined at runtime when a method is called.
Why it's wrong here
MRO is computed at class definition time.
✓
The MRO of a class can be viewed using the __mro__ attribute.
Why this is correct
Correct: __mro__ is a tuple of classes in MRO order.
Related concept
Read the scenario before looking for a memorised answer.
✓
C3 linearization is the algorithm used for MRO in Python 3.
Why this is correct
Correct: C3 ensures monotonicity and consistent order.
Related concept
Read the scenario before looking for a memorised answer.
✗
Python uses a depth-first left-to-right algorithm for MRO.
Why it's wrong here
That was used in old-style classes; new-style classes use C3 linearization.
✓
super() uses the MRO to determine which method to call.
Why this is correct
Correct: super() follows the MRO.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Python Institute often tests the misconception that MRO is determined dynamically at runtime (option A) or that Python still uses a simple depth-first left-to-right algorithm (option D), when in fact Python 3 exclusively uses the C3 linearization algorithm computed at class definition time.
Detailed technical explanation
How to think about this question
The C3 linearization algorithm merges the linearizations of parent classes while preserving the local precedence order and ensuring monotonicity, which prevents inconsistent method resolution in complex diamond inheritance hierarchies. The MRO is stored as a tuple in `__mro__` and is also accessible via the `mro()` method, which returns a list; both are computed once when the class is created and remain immutable thereafter. Understanding MRO is critical when using `super()` in multiple inheritance scenarios, as it determines which class's method is invoked next.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Object-Oriented Programming — This question tests Object-Oriented Programming — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The MRO of a class can be viewed using the __mro__ attribute. — Option B is correct because the `__mro__` attribute on a class returns a tuple of classes in the exact order that Python uses to resolve methods and attributes. This attribute is computed at class definition time using the C3 linearization algorithm, and it provides a direct, read-only view of the resolution order for that class.
What should I do if I get this PCAP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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