Type Hints · interview question
A bug appears around protocols. What is the strongest first debugging move?
Multiple choiceMediumchapter-10-curatedpremiumtype-hintsprotocols
from typing import Protocol
class PaymentGateway(Protocol):
def charge(self, amount: int) -> str: ...Answer and explanation
Correct answer
A. 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. Over-coupling to one concrete class makes testing and substitution harder than necessary.
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