Quick Answer
The answer is `super().method()`, as it is the safest way to call a parent method in multiple inheritance because it respects the Method Resolution Order (MRO) defined by Python’s C3 linearization algorithm. Unlike hard-coded calls like `B.method(self)`, using `super()` dynamically follows the MRO chain, ensuring the correct next class is invoked even if the inheritance hierarchy changes. On the Certified Associate Python Programmer PCAP exam, this tests your understanding of cooperative multiple inheritance and the `__mro__` attribute; a common trap is assuming `super()` always calls the immediate parent, when in fact it calls the next class in the MRO. Remember the mnemonic: “super() follows the MRO, not the parent you know.”
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.
Consider a class `D` that inherits from multiple base classes `B` and `C`. The developer wants to call a method from a specific parent class while ensuring correct method resolution order (MRO). Which is the safest way?
`self.method()`
Why wrong: This calls the method on the instance itself, which would be the most derived version, not necessarily from a specific parent.
`ParentClass.method(self)`
Why wrong: This bypasses the MRO and can lead to inconsistent behavior in diamond inheritance.
`super().method()`
`super()` follows the MRO, calling the method from the next class in line.
`BaseClass.method(self)`
Why wrong: Same as A, bypasses MRO.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
`super().method()`
In Python, `super().method()` is the safest way to call a method from a parent class in a multiple inheritance scenario because it respects the Method Resolution Order (MRO) defined by the C3 linearization algorithm. This ensures that the method is resolved from the next class in the MRO, avoiding hard-coded references that could break if the inheritance hierarchy changes. It also correctly handles cooperative multiple inheritance, where each class in the MRO can collaborate via `super()` calls.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
`self.method()`
Why it's wrong here
This calls the method on the instance itself, which would be the most derived version, not necessarily from a specific parent.
`ParentClass.method(self)`
Why it's wrong here
This bypasses the MRO and can lead to inconsistent behavior in diamond inheritance.
`super().method()`
Why this is correct
`super()` follows the MRO, calling the method from the next class in line.
Related concept
Read the scenario before looking for a memorised answer.
`BaseClass.method(self)`
Why it's wrong here
Same as A, bypasses MRO.
Common exam traps
Python Institute often tests the misconception that `super()` only calls the immediate parent class, when in fact it follows the full MRO, and candidates mistakenly choose a hard-coded parent call (like Option B or D) thinking it is more explicit and safer.
Detailed technical explanation
Under the hood, Python's `super()` returns a proxy object that delegates method calls to the next class in the MRO, which is computed at class definition time using the C3 linearization algorithm. This algorithm ensures a consistent order that respects local precedence and monotonicity, making `super()` essential for cooperative multiple inheritance (e.g., in frameworks like Django or Tkinter). A subtle behavior is that `super()` without arguments in Python 3 automatically uses `__class__` and `self` from the enclosing scope, but in Python 2 it required explicit arguments, which is a common source of confusion.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
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FAQ
Object-Oriented Programming — This question tests Object-Oriented Programming — Read the scenario before looking for a memorised answer..
The correct answer is: `super().method()` — In Python, `super().method()` is the safest way to call a method from a parent class in a multiple inheritance scenario because it respects the Method Resolution Order (MRO) defined by the C3 linearization algorithm. This ensures that the method is resolved from the next class in the MRO, avoiding hard-coded references that could break if the inheritance hierarchy changes. It also correctly handles cooperative multiple inheritance, where each class in the MRO can collaborate via `super()` calls.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This PCAP practice question is part of Courseiva's free Python Institute certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCAP exam.
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