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Covers Python 3.12+ with FastAPI, Pydantic, async patterns, pytest, SQLAlchemy, and uv toolchain.
This skill is limited to using the following tools:
references/api.mdreferences/async.mdreferences/core.mdreferences/data.mdreferences/database.mdreferences/debugging.mdreferences/deployment.mdreferences/fastapi.mdreferences/pydantic.mdreferences/testing.mdreferences/types.mdPython Development
Modern Python 3.12+ development with FastAPI ecosystem.
Stack Overview
| Layer | Default | Alternatives |
|---|---|---|
| Runtime | Python 3.12+ | - |
| Package Manager | uv | rye, poetry |
| Linter/Formatter | ruff | black + flake8 |
| Type Checker | mypy (strict) | pyright |
| Web Framework | FastAPI | Flask, Django |
| Validation | Pydantic v2 | - |
| ORM | SQLAlchemy 2.0 | - |
| Data Processing | Polars | Pandas |
| HTTP Client | httpx | aiohttp |
| Testing | pytest | - |
| Containerization | Docker | - |
Topics
| Topic | Use For |
|---|---|
| Core | Project setup, pyproject.toml, modern Python features |
| FastAPI | REST APIs, routing, dependency injection, middleware |
| Pydantic | Data models, validation, settings management |
| Async | async/await, TaskGroup, context managers |
| Types | Type hints, mypy, Protocol, generics |
| Testing | pytest, fixtures, mocking, async tests |
| Database | SQLAlchemy 2.0, Alembic migrations, transactions |
| Data | Polars, ETL pipelines, schema validation |
| API Clients | httpx, retries, rate limiting, error handling |
| Deployment | Docker, logging, OpenTelemetry, health checks |
| Debugging | pdb, structlog, pytest debugging, remote debugging |
Critical Rules
Always
- Use
async deffor I/O-bound operations - Use Pydantic models for external input validation
- Use
pathlib.Pathfor file operations - Run mypy in CI/CD pipeline
Never
- Block the event loop with sync I/O in async code
- Use mutable default arguments (
def foo(items=[])) - Skip validation on external input
- Hardcode configuration values (use pydantic-settings)
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