//// tab | Python 3.10+

```Python hl_lines="1"
async def needy_dependency(fresh_value: Annotated[str, Depends(get_value, use_cache=False)]):
    return {"fresh_value": fresh_value}
```

////

//// tab | Python 3.10+ без Annotated

/// tip | Подсказка

Предпочтительнее использовать версию с аннотацией, если это возможно.

///

```Python hl_lines="1"

    media_type = "application/x-level-5"


async def dep0(response: Response):
    response.headers["x-level0"] = "True"


async def dep1(response: Response):
    response.headers["x-level1"] = "True"


async def dep2(response: Response):
    response.headers["x-level2"] = "True"


async def dep3(response: Response):
    response.headers["x-level3"] = "True"


async def dep4(response: Response):

from fastapi import FastAPI
from fastapi.responses import RedirectResponse

app = FastAPI()


@app.get("/typer")
async def redirect_typer():

from fastapi import FastAPI

app = FastAPI(swagger_ui_parameters={"syntaxHighlight": {"theme": "obsidian"}})


@app.get("/users/{username}")
async def read_user(username: str):

這就是一個 Python 函式。

它將會在 **FastAPI** 收到一個使用 `GET` 操作、網址為「`/`」的請求時被呼叫。

在這種情況下，它是一個 `async` 函式。

---

你也可以將它定義為一般函式，而不是 `async def`：

{* ../../docs_src/first_steps/tutorial003_py310.py hl[7] *}

/// note

如果你不知道差別，請查看 [Async: *"In a hurry?"*](../async.md#in-a-hurry)。

///

### 第五步：回傳內容 { #step-5-return-the-content }

from fastapi import FastAPI
from fastapi.middleware.gzip import GZipMiddleware

app = FastAPI()

app.add_middleware(GZipMiddleware, minimum_size=1000, compresslevel=5)


@app.get("/")
async def main():

from typing import Annotated

from fastapi import FastAPI, Query

app = FastAPI()


@app.get("/items/")
async def read_items(q: Annotated[list, Query()] = []):
    query_items = {"q": q}

// For each call, unfreezeServices must be called once.
func freezeServices() {
	// Use atomics for globalServiceFreeze, so we can read without locking.
	// We need a lock since we are need the 2 atomic values to remain in sync.
	globalServiceFreezeMu.Lock()
	// If multiple calls, first one creates channel.
	globalServiceFreezeCnt++
	if globalServiceFreezeCnt == 1 {
		globalServiceFreeze.Store(make(chan struct{}))
	}

                  type = "archive"
                  platform = "linux"
                  architecture = Architecture.current();
              }
            }
            tasks.register("setupDistro", Sync) {
                from(elasticsearch_distributions.test_distro)
                into("build/distro")
            }
        """

        when:

            "content": {
                "application/json": {
                    "example": {"id": "bar", "value": "The bar tenders"}
                }
            },
        },
    },
)
async def read_item(item_id: str):
    if item_id == "foo":
        return {"id": "foo", "value": "there goes my hero"}
    else: