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Meta·Software Engineer·Technical Phone Screen·Junior

Junior
May 2026

Summary

Quick Meta technical screen, just one Python question about inheritance. Not much to report.

Questions Asked (1)

Q1

Can a subclass in Python inherit from more than one base class?

Algorithms & Data StructuresTechnical Trade-offs
Author's notes

Pretty basic multiple inheritance question.

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AI HintsAI Generated

Suggested Approach

Start with a clear 'yes' and immediately mention multiple inheritance. Then explain the method resolution order (MRO) and how Python uses C3 linearization to resolve conflicts. Finally, discuss practical trade-offs and alternatives like composition, showing you understand both the mechanics and design implications.

Pro tip: Mention that while multiple inheritance is powerful, it can lead to the diamond problem; showing awareness of when to avoid it (e.g., favoring composition) demonstrates senior-level judgment.

1. Direct Answer

Confirm that Python supports multiple inheritance, allowing a subclass to inherit from multiple base classes.

2. Explain MRO

Describe how Python resolves method and attribute lookup using the MRO, computed via the C3 linearization algorithm.

3. Address the Diamond Problem

Discuss the diamond problem and how Python's MRO handles it, ensuring a consistent and predictable order.

4. Discuss Trade-offs

Weigh the benefits (code reuse, mixins) against drawbacks (complexity, ambiguity) and mention alternatives like composition.

5. Provide Examples

Give a simple code example or a real-world scenario (e.g., mixins) to illustrate multiple inheritance in practice.

Key Points to Mention

  • Python supports multiple inheritance (e.g., class C(A, B):).
  • Method Resolution Order (MRO) determines attribute lookup order.
  • C3 linearization algorithm ensures a consistent MRO.
  • The diamond problem and how Python avoids it.
  • Use of super() to call methods in the MRO chain.
  • Trade-offs: complexity vs. code reuse; composition as an alternative.

AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.