Python Interview Questions · interview question

Which practice avoids a common mistake with FastAPI, Pydantic, and Request Validation?

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Do not let the route handler become the entire application by mixing validation, orchestration, persistence, and transport detail in one function.Silence the FastAPI, Pydantic, and Request Validation problem by using broad catches, hidden globals, or extra shared mutable state.Prefer the version of FastAPI, Pydantic, and Request Validation that makes behavior less predictable as long as the code still runs.Ignore the FastAPI, Pydantic, and Request Validation issue and rely on team discipline instead of clearer APIs or invariants.

Answer and explanation

Correct answer

A. Do not let the route handler become the entire application by mixing validation, orchestration, persistence, and transport detail in one function.

Why

Do not let the route handler become the entire application by mixing validation, orchestration, persistence, and transport detail in one function. This is a common failure mode in real Python code and a frequent interview follow-up.

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Which practice avoids a common mistake with FastAPI, Pydantic, and Request Validation?

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