The answer is to use @classmethod when you need a method that does not depend on instance state but can still be called on the class. This is because a classmethod automatically receives the class itself as its first argument, conventionally named cls, allowing it to access or modify class-level data without requiring an instance. In contrast, a staticmethod does not receive any implicit first argument, making it suitable for utility functions that are logically grouped within a class but have no interaction with either the class or its instances. On the Certified Associate Python Programmer PCAP exam, this distinction tests your understanding of Python’s method decorators and their binding behavior—a common trap is confusing staticmethod with classmethod when the method needs to reference the class. A simple memory tip: if your method needs cls, use classmethod; if it needs nothing, use staticmethod.
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.
A developer defines a class 'MathUtils' with a method that performs a calculation either on the class or on instances. Which method type should be used for a method that does not depend on instance state but can be called on the class?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
@classmethod
def add(cls, a, b): return a + b
Option B correctly uses @classmethod, which receives the class as first argument and can be called on the class or instance. Option A uses @staticmethod, which does not receive cls. Option C is a regular instance method requiring self. Option D uses @property, which is for attribute-like access.
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.
✓
@classmethod
def add(cls, a, b): return a + b
Why this is correct
Class methods receive the class as first argument and can be called on the class or instance.
Related concept
Read the scenario before looking for a memorised answer.
✗
def add(self, a, b): return a + b
Why it's wrong here
Instance methods require an instance to be called.
✗
@property
def add(self): return lambda a,b: a+b
Why it's wrong here
This is a property returning a function, not a method intended for calculation.
✗
@staticmethod
def add(a, b): return a + b
Why it's wrong here
Static methods do not have access to the class; they are just functions in the class namespace.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which PCAP exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: @classmethod
def add(cls, a, b): return a + b — Option B correctly uses @classmethod, which receives the class as first argument and can be called on the class or instance. Option A uses @staticmethod, which does not receive cls. Option C is a regular instance method requiring self. Option D uses @property, which is for attribute-like access.
What should I do if I get this PCAP question wrong?
Identify which PCAP exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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