Sync fastapi docs from b5ca1324 on 2025-12-07

docs_src/events/tutorial001.py

@@ -0,0 +1,16 @@
+from fastapi import FastAPI
+
+app = FastAPI()
+
+items = {}
+
+
+@app.on_event("startup")
+async def startup_event():
+    items["foo"] = {"name": "Fighters"}
+    items["bar"] = {"name": "Tenders"}
+
+
+@app.get("/items/{item_id}")
+async def read_items(item_id: str):
+    return items[item_id]

docs_src/events/tutorial002.py

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+from fastapi import FastAPI
+
+app = FastAPI()
+
+
+@app.on_event("shutdown")
+def shutdown_event():
+    with open("log.txt", mode="a") as log:
+        log.write("Application shutdown")
+
+
+@app.get("/items/")
+async def read_items():
+    return [{"name": "Foo"}]

docs_src/events/tutorial003.py

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+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+
+
+def fake_answer_to_everything_ml_model(x: float):
+    return x * 42
+
+
+ml_models = {}
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    # Load the ML model
+    ml_models["answer_to_everything"] = fake_answer_to_everything_ml_model
+    yield
+    # Clean up the ML models and release the resources
+    ml_models.clear()
+
+
+app = FastAPI(lifespan=lifespan)
+
+
+@app.get("/predict")
+async def predict(x: float):
+    result = ml_models["answer_to_everything"](x)
+    return {"result": result}