接下来的章节会介绍其中的好几种。

## 顺序很重要 { #order-matters }

有时，*路径操作*中的路径是写死的。

比如要使用 `/users/me` 获取当前用户的数据。

然后还要使用 `/users/{user_id}`，通过用户 ID 获取指定用户的数据。

由于*路径操作*是按顺序依次运行的，因此，一定要在 `/users/{user_id}` 之前声明 `/users/me` ：

{* ../../docs_src/path_params/tutorial003_py310.py hl[6,11] *}

否则，`/users/{user_id}` 将匹配 `/users/me`，FastAPI 会**认为**正在接收值为 `"me"` 的 `user_id` 参数。

同样，你不能重复定义一个路径操作：

from fastapi import FastAPI

app = FastAPI()


@app.get("/items/", tags=["items"])
async def read_items():
    return [{"name": "Foo", "price": 42}]


@app.get("/users/", tags=["users"])
async def read_users():
    return [{"username": "johndoe"}]


@app.get("/elements/", tags=["items"], deprecated=True)
async def read_elements():

    without any of its other classes -- but is also available in a second
    "version" that omits the class to avoid conflicts with the copy in Guava
    itself. The idea is:

    - If users want only ListenableFuture, they depend on listenablefuture-1.0.

    - If users want all of Guava, they depend on guava, which, as of Guava
    27.0, depends on
    listenablefuture-9999.0-empty-to-avoid-conflict-with-guava. The 9999.0-...

app = FastAPI()

router = APIRouter()


@router.get("/users/{id}")
def read_user(segment: str, id: str):
    return {"segment": segment, "id": id}


app.include_router(router, prefix="/{segment}")


client = TestClient(app)


def test_get():
    response = client.get("/seg/users/foo")
    assert response.status_code == 200, response.text

 * {@code Iterable}. Except as noted, each method has a corresponding {@link Iterator}-based method
 * in the {@link Iterators} class.
 *
 * <p><b>Java 8+ users:</b> several common uses for this class are now more comprehensively
 * addressed by the new {@link java.util.stream.Stream} library. Read the method documentation below

@app.get("/items/")
async def read_items(commons: dict = Depends(common_parameters)):
    return {"message": "Hello Items!", "params": commons}


@app.get("/users/")
async def read_users(commons: dict = Depends(common_parameters)):
    return {"message": "Hello Users!", "params": commons}


client = TestClient(app)


async def override_dependency(q: str | None = None):
    return {"q": q, "skip": 5, "limit": 10}

		Result  string
		Vars    []interface{}
	}{
		{
			[]clause.Interface{clause.Delete{}, clause.From{}},
			"DELETE FROM `users`", nil,
		},
		{
			[]clause.Interface{clause.Delete{Modifier: "LOW_PRIORITY"}, clause.From{}},
			"DELETE LOW_PRIORITY FROM `users`", nil,
		},
	}

	for idx, result := range results {
		t.Run(fmt.Sprintf("case #%v", idx), func(t *testing.T) {

     * users. This method should return the same text that the ACL
     * editor in Windows would display.
     * <p>
     * Specifically, if the SID has
     * been resolved and it is not a domain SID or builtin account,
     * the full DOMAIN\name form of the account will be
     * returned (e.g. MYDOM\alice or MYDOM\Domain Users).
     * If the SID has been resolved but it is is a domain SID,

*경로 처리*를 만들 때 고정 경로를 갖고 있는 상황들을 맞닥뜨릴 수 있습니다.

`/users/me`처럼, 현재 사용자의 데이터를 가져온다고 합시다.

사용자 ID를 이용해 특정 사용자의 정보를 가져오는 경로 `/users/{user_id}`도 있습니다.

*경로 처리*는 순차적으로 평가되기 때문에 `/users/me`에 대한 경로가 `/users/{user_id}` 이전에 먼저 선언되었는지 확인해야 합니다:

{* ../../docs_src/path_params/tutorial003_py310.py hl[6,11] *}

그렇지 않으면 `/users/{user_id}`에 대한 경로가 `/users/me`에도 매칭되어, 매개변수 `user_id`에 `"me"` 값이 들어왔다고 "생각하게" 됩니다.

async def get_items():
    return [
        {"name": "Plumbus", "price": 3},
        {"name": "Portal Gun", "price": 9001},
    ]


@app.post("/users/", response_model=ResponseMessage, tags=["users"])
async def create_user(user: User):