⏮️ 👆 ✔️ 💯, ⤴️ 👆 💪 ♻ **FastAPI** ⏬ 🌖 ⏮️ 1️⃣, & ⚒ 💭 👈 🌐 👆 📟 👷 ☑ 🏃 👆 💯.

🚥 🌐 👷, ⚖️ ⏮️ 👆 ⚒ 💪 🔀, & 🌐 👆 💯 🚶‍♀️, ⤴️ 👆 💪 📌 👆 `fastapi` 👈 🆕 ⏮️ ⏬.

## 🔃 💃

👆 🚫🔜 🚫 📌 ⏬ `starlette`.

🎏 ⏬ **FastAPI** 🔜 ⚙️ 🎯 🆕 ⏬ 💃.

, 👆 💪 ➡️ **FastAPI** ⚙️ ☑ 💃 ⏬.

## 🔃 Pydantic

Pydantic 🔌 💯 **FastAPI** ⏮️ 🚮 👍 💯, 🆕 ⏬ Pydantic (🔛 `1.0.0`) 🕧 🔗 ⏮️ FastAPI.

from typing import Dict, List, Optional

from fastapi import FastAPI
from pydantic import BaseModel, Field
from starlette.testclient import TestClient

app = FastAPI()


class Item(BaseModel):
    name: str = Field(alias="aliased_name")
    price: Optional[float] = None
    owner_ids: Optional[List[int]] = None


@app.get("/items/valid", response_model=Item)
def get_valid():
    return Item(aliased_name="valid", price=1.0)

/// note | "Technical Details"

You could also use `from starlette.middleware.cors import CORSMiddleware`.

**FastAPI** provides several middlewares in `fastapi.middleware` just as a convenience for you, the developer. But most of the available middlewares come directly from Starlette.

Comme vous l'avez vu dans la documentation, FastAPI se tient sur les épaules des géants, Starlette et Pydantic.

Vous pouvez également parrainer :

* <a href="https://github.com/sponsors/samuelcolvin" class="external-link" target="_blank">Samuel Colvin (Pydantic)</a>
* <a href="https://github.com/sponsors/encode" class="external-link" target="_blank">Encode (Starlette, Uvicorn)</a>

---

from typing import Any, Callable

from starlette.background import BackgroundTasks as StarletteBackgroundTasks
from typing_extensions import Annotated, Doc, ParamSpec

P = ParamSpec("P")


class BackgroundTasks(StarletteBackgroundTasks):
    """
    A collection of background tasks that will be called after a response has been
    sent to the client.

    Read more about it in the

`FastAPI` ist eine Python-Klasse, die die gesamte Funktionalität für Ihre API bereitstellt.

/// note | "Technische Details"

`FastAPI`  ist eine Klasse, die direkt von `Starlette` erbt.

Sie können alle <a href="https://www.starlette.io/" class="external-link" target="_blank">Starlette</a>-Funktionalitäten auch mit `FastAPI` nutzen.

///

### Schritt 2: Erzeugen einer `FastAPI`-„Instanz“

```Python hl_lines="3"

**Typer**는 FastAPI의 동생입니다. 그리고 **FastAPI의 CLI**가 되기 위해 생겼습니다. ⌨️ 🚀

## 요구사항

FastAPI는 거인들의 어깨 위에 서 있습니다:

* 웹 부분을 위한 <a href="https://www.starlette.io/" class="external-link" target="_blank">Starlette</a>.
* 데이터 부분을 위한 <a href="https://docs.pydantic.dev/" class="external-link" target="_blank">Pydantic</a>.

## 설치

<div class="termy">

```console
$ pip install fastapi

我甚至为它做了不少贡献，让它完美兼容了 JSON Schema，支持多种方式定义约束声明，并基于多个编辑器，改进了它对编辑器支持（类型检查、自动补全）。

在开发期间，我还为 <a href="https://www.starlette.io/" class="external-link" target="_blank">**Starlette**</a> 做了不少贡献，这是另一个关键需求项。

## 开发

当我启动 **FastAPI** 开发的时候，绝大多数部件都已经就位，设计已经定义，需求项和工具也已经准备就绪，相关标准与规范的知识储备也非常清晰而新鲜。

## 未来

至此，**FastAPI** 及其理念已经为很多人所用。

对于很多用例，它比以前很多备选方案都更适用。

{!> ../../docs_src/request_files/tutorial002_py39.py!}
```

////

👆 🔜 📨, 📣, `list` `bytes` ⚖️ `UploadFile`Ⓜ.

/// note | "📡 ℹ"

👆 💪 ⚙️ `from starlette.responses import HTMLResponse`.

**FastAPI** 🚚 🎏 `starlette.responses` `fastapi.responses` 🏪 👆, 👩‍💻. ✋️ 🌅 💪 📨 👟 🔗 ⚪️➡️ 💃.

///

### 💗 📁 📂 ⏮️ 🌖 🗃

& 🎏 🌌 ⏭, 👆 💪 ⚙️ `File()` ⚒ 🌖 🔢, `UploadFile`:

import pytest
from fastapi import APIRouter, FastAPI
from fastapi.routing import APIRoute
from fastapi.testclient import TestClient
from starlette.routing import Route

app = FastAPI()


class APIRouteA(APIRoute):
    x_type = "A"


class APIRouteB(APIRoute):
    x_type = "B"


class APIRouteC(APIRoute):
    x_type = "C"


router_a = APIRouter(route_class=APIRouteA)
router_b = APIRouter(route_class=APIRouteB)