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Classes and Objects · interview question

A bug appears around factories. What is the strongest first debugging move?

Multiple choiceHardchapter-7-curatedpremiumclasses-and-objectsfactories
python
from dataclasses import dataclass

@dataclass
class Money:
    cents: int

    @classmethod
    def from_dollars(cls, dollars: float) -> "Money":
        return cls(int(round(dollars * 100)))
Choose one answer
Answer and explanation

Correct answer

D. Trace one concrete example, inspect the state transitions, and compare them to the intended rule before rewriting anything.

Why

That approach is reliable because it creates evidence. Forcing all construction through one overloaded initializer can make object creation harder to read.

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