The correct answer is AttributeError. This occurs because the code attempts to call `obj.get_value()` on an instance of `MyClass`, but `MyClass` does not define a `get_value` method, so Python raises an `AttributeError` at runtime when it cannot find the attribute on the object or its class. This error is a core concept tested on the Certified Associate Python Programmer PCAP exam, specifically under object-oriented programming and attribute lookup mechanics. A common trap is confusing this with a `NameError` or `TypeError`, but remember that Python dynamically resolves attributes—if a method name is missing, it is an attribute lookup failure, not a syntax or type mismatch. A helpful memory tip: “If it’s not there, it’s an AttributeError—Python checks the object, then the class, then raises the error.”
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
AttributeError
Option C is correct because the code attempts to call `obj.get_value()` on an instance of `MyClass`, but `MyClass` does not define a `get_value` method. In Python, this raises an `AttributeError` since the attribute is not found on the object or its class. The error occurs at runtime, not during compilation, because Python dynamically looks up attributes.
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.
✗
None
Why it's wrong here
No value is printed because an exception is raised.
✗
0
Why it's wrong here
No; the attribute value is 10 but not accessible.
✓
AttributeError
Why this is correct
AttributeError because `__private` is mangled to `_MyClass__private` and cannot be accessed directly from outside.
Related concept
Read the scenario before looking for a memorised answer.
✗
10
Why it's wrong here
Direct access would print 10 only if there were no name mangling; but due to mangling, the attribute name is different.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Python Institute often tests the misconception that a missing method will silently return `None` or a default value, but in Python, accessing an undefined attribute on an object always raises an `AttributeError` unless a `__getattr__` method is defined to handle it.
Detailed technical explanation
How to think about this question
Under the hood, Python's attribute lookup follows the descriptor protocol and the MRO (Method Resolution Order). When `obj.get_value` is accessed, Python first checks the instance's `__dict__`, then the class and its bases. If not found, it raises `AttributeError`. This dynamic lookup is fundamental to Python's duck typing and allows for flexible patterns like `__getattr__`, but it also means missing methods cause runtime errors rather than compile-time errors as in statically typed languages.
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
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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: AttributeError — Option C is correct because the code attempts to call `obj.get_value()` on an instance of `MyClass`, but `MyClass` does not define a `get_value` method. In Python, this raises an `AttributeError` since the attribute is not found on the object or its class. The error occurs at runtime, not during compilation, because Python dynamically looks up attributes.
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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