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python3-web

Python web and API development enforcing strict route/domain/data layer separation, Pydantic v2 strict request-response models, edge-resolved auth, and async-safe HTTP clients. Use when working with FastAPI, Starlette, Django, Flask, HTTP endpoints, request models, authentication flows, async handlers, or any Python web framework task.

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Jamie-BitFlight/claude_skills
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Python Web

Load standards-for-python-development for the shared rules. Load python3-typing for request/response modeling. Load python3-testing for endpoint and auth tests.

Quality Checklist

  • Route handlers contain NO business logic — only validation, delegation, response mapping
  • No framework objects (Request, Response, ORM models) leak into domain layer
  • model_config = {"strict": True} on all request models
  • Separate request and response models per endpoint — never reuse ORM models as API schemas
  • Auth resolved at edge; domain functions receive typed identity, never raw tokens
  • Domain exceptions mapped to HTTP status codes at boundary, not scattered through handlers
  • Async handlers use httpx.AsyncClient — never requests (blocks event loop)
  • Background tasks hold no references to request-scoped objects

Gotchas

TrapWhat to do instead
FastAPI dep ordering assumptionsDependencies resolve by graph, not definition order — chain explicitly if order matters
Pydantic v1/v2 method mixingv2: model_dump(), model_dump_json(), model_validate() — never .dict() / .json()
import requests in async handlerrequests blocks event loop; use httpx.AsyncClient with async with
Django ORM in async viewsBare Model.objects.get() blocks; use aget() (Django 4.1+) or sync_to_async
allow_origins=["*"]Enumerate specific origins — * disables credential support, security risk
Single model for request + response + DBThree separate models: CreateUserRequest, UserResponse, UserDB

Decision Table: Sync vs Async

ScenarioUseWhy
CPU-bound processingSync + thread poolasync doesn't help CPU work
Multiple external API callsAsync + httpx.AsyncClientConcurrent I/O without threads
Simple CRUD with sync ORMSync handlersAsync adds complexity with no benefit
WebSocket connectionsAsync (required)Inherently long-lived

Layer Separation

HTTP Layer (routes) → validated typed request models
Domain Layer (logic) → typed domain objects
Data Layer (repo/ORM)

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