items = [
    Item(name="Plumbus", price=32.99),
    Item(name="Portal Gun", price=999.99),
    Item(name="Meeseeks Box", price=49.99),
]


@app.get("/items/stream", response_class=EventSourceResponse)
async def stream_items(
    last_event_id: Annotated[int | None, Header()] = None,
) -> AsyncIterable[ServerSentEvent]:
    start = last_event_id + 1 if last_event_id is not None else 0
    for i, item in enumerate(items):

```Python
with open("file.txt") as file:
    file.read()
```

最近の Python には「非同期コンテキストマネージャ」もあります。`async with` で使います:

```Python
async with lifespan(app):
    await do_stuff()
```

このようにコンテキストマネージャ（または非同期コンテキストマネージャ）を作ると、`with` ブロックに入る前に `yield` より前のコードが実行され、`with` ブロックを出た後に `yield` より後ろのコードが実行されます。

上のコード例では直接それを使ってはいませんが、FastAPI に渡して内部で使ってもらいます。

/// tip

Pydantic이 **Rust** 측에서 직렬화하므로, 반환 타입을 선언하지 않았을 때보다 훨씬 높은 **성능**을 얻게 됩니다.

///

### 비동기 아님 *경로 처리 함수* { #non-async-path-operation-functions }

일반 `def` 함수(`async` 없이)도 사용할 수 있으며, 동일하게 `yield`를 사용할 수 있습니다.

FastAPI가 이벤트 루프를 막지 않도록 올바르게 실행되게 보장합니다.

이 경우 함수가 async가 아니므로, 올바른 반환 타입은 `Iterable[Item]`입니다:

	workers    atomic.Int64
	maxWorkers int64

	// workerStartMu sync.Mutex
	lastStarted time.Time

	wg sync.WaitGroup

	// Channel of log entries.
	// Reading logCh must hold read lock on logChMu (to avoid read race)
	// Sending a value on logCh must hold read lock on logChMu (to avoid closing)
	logCh   chan any
	logChMu sync.RWMutex

	// If this webhook is being re-configured we will

./mc rm -r --force myminio/versioned >/dev/null

## mirror again to create another set of version on top
./mc mirror internal myminio/versioned/ --quiet >/dev/null

expected_checksum=$(./mc cat internal/dsync/drwmutex.go | md5sum)

user_count=$(./mc admin user list myminio/ | wc -l)
policy_count=$(./mc admin policy list myminio/ | wc -l)

kill $pid

	exit 1
fi

got_checksum=$(./mc cat myminio/versioned/dsync/drwmutex.go | md5sum)
if [ "${expected_checksum}" != "${got_checksum}" ]; then
	echo "BUG: decommission failed on encrypted objects: expected ${expected_checksum} got ${got_checksum}"
	exit 1
fi

got_checksum_1=$(./mc cat myminio/versioned-1/dsync/drwmutex.go | md5sum)
if [ "${expected_checksum}" != "${got_checksum_1}" ]; then

///

### Funções de operação de rota não assíncronas { #non-async-path-operation-functions }

Você também pode usar funções `def` normais (sem `async`) e usar `yield` da mesma forma.

O FastAPI garantirá que sejam executadas corretamente para não bloquear o event loop.

from fastapi import FastAPI, Query

app = FastAPI()


@app.get("/items/")
async def read_items(q: str | None = Query(default=None, min_length=3, max_length=50)):
    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
    if q:
        results.update({"q": q})

}

// Parse get data type from dialector
func Parse(dest interface{}, cacheStore *sync.Map, namer Namer) (*Schema, error) {
	return ParseWithSpecialTableName(dest, cacheStore, namer, "")
}

// ParseWithSpecialTableName get data type from dialector with extra schema table
func ParseWithSpecialTableName(dest interface{}, cacheStore *sync.Map, namer Namer, specialTableName string) (*Schema, error) {
	if dest == nil {

from fastapi import FastAPI, HTTPException

app = FastAPI()

items = {"foo": "The Foo Wrestlers"}


@app.get("/items/{item_id}")
async def read_item(item_id: str):
    if item_id not in items:
        raise HTTPException(status_code=404, detail="Item not found")