{"id":27826,"date":"2026-06-03T04:27:35","date_gmt":"2026-06-03T04:27:35","guid":{"rendered":"https:\/\/sharpinterview.online\/?sharp_quiz=python-interview-fastapi-pydantic-validation-pitfall"},"modified":"2026-06-03T04:27:35","modified_gmt":"2026-06-03T04:27:35","slug":"python-interview-fastapi-pydantic-validation-pitfall","status":"publish","type":"sharp_quiz","link":"https:\/\/sharpinterview.online\/?sharp_quiz=python-interview-fastapi-pydantic-validation-pitfall","title":{"rendered":"Python: Which practice avoids a common mistake with FastAPI, Pydantic, and Request Validation?"},"content":{"rendered":"<h2>Question<\/h2>\n<p>Which practice avoids a common mistake with FastAPI, Pydantic, and Request Validation?<\/p>\n<ol type=\"A\">\n<li>Ignore the FastAPI, Pydantic, and Request Validation issue and rely on team discipline instead of clearer APIs or invariants.<\/li>\n<li>Do not let the route handler become the entire application by mixing validation, orchestration, persistence, and transport detail in one function.<\/li>\n<li>Silence the FastAPI, Pydantic, and Request Validation problem by using broad catches, hidden globals, or extra shared mutable state.<\/li>\n<li>Prefer the version of FastAPI, Pydantic, and Request Validation that makes behavior less predictable as long as the code still runs.<\/li>\n<\/ol>\n<h2>Hint<\/h2>\n<p>Look for the option that protects correctness instead of hiding the problem.<\/p>\n<h2>Answer and rationale<\/h2>\n<p><strong>Correct answer:<\/strong> B. Do not let the route handler become the entire application by mixing validation, orchestration, persistence, and transport detail in one function.<\/p>\n<p>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.<\/p>\n<p><strong>Track:<\/strong> Python<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Which practice avoids a common mistake with FastAPI, Pydantic, and Request Validation?<\/p>\n","protected":false},"author":1,"featured_media":0,"template":"","topic":[88,128,89],"difficulty":[7],"class_list":["post-27826","sharp_quiz","type-sharp_quiz","status-publish","hentry","topic-python","topic-python-core-fastapi-pydantic-and-request-validation","topic-python-interview-questions","difficulty-medium"],"_links":{"self":[{"href":"https:\/\/sharpinterview.online\/index.php?rest_route=\/wp\/v2\/sharp_quiz\/27826","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sharpinterview.online\/index.php?rest_route=\/wp\/v2\/sharp_quiz"}],"about":[{"href":"https:\/\/sharpinterview.online\/index.php?rest_route=\/wp\/v2\/types\/sharp_quiz"}],"author":[{"embeddable":true,"href":"https:\/\/sharpinterview.online\/index.php?rest_route=\/wp\/v2\/users\/1"}],"wp:attachment":[{"href":"https:\/\/sharpinterview.online\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=27826"}],"wp:term":[{"taxonomy":"topic","embeddable":true,"href":"https:\/\/sharpinterview.online\/index.php?rest_route=%2Fwp%2Fv2%2Ftopic&post=27826"},{"taxonomy":"difficulty","embeddable":true,"href":"https:\/\/sharpinterview.online\/index.php?rest_route=%2Fwp%2Fv2%2Fdifficulty&post=27826"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}