FastAPI Advanced Patterns ()

Production-ready FastAPI patterns for modern Python backends.

Lifespan Management ()

Modern Lifespan Context Manager

from contextlib import asynccontextmanager
from fastapi import FastAPI
from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession
import redis.asyncio as redis

@asynccontextmanager
async def lifespan(app: FastAPI):
    """Application lifespan with resource management."""
    # Startup
    app.state.db_engine = create_async_engine(