ound-sign:before{content:"\f154"}.fa-power-off:before{content:"\f011"}.fa-pray:before{content:"\f683"}.fa-praying-hands:before{content:"\f684"}.fa-prescription:before{content:"\f5b1"}.fa-prescription-bottle:before{content:"\f485"}.fa-prescription-bottle-alt:before{content:"\f486"}.fa-print:before{content:"\f02f"}.fa-procedures:before{content:"\f487"}.fa-product-hunt:before{content:"\f288"}.fa-project-diagram:before{content:"\f542"}.fa-pushed:before{content:"\f3e1"}.fa-puzzle-piece:before{content...

如果你创建一个导入并使用 FastAPI 的 Python 文件，然后使用虚拟环境中的 Python 运行它，它将使用你本地的 FastAPI 源码。

并且如果你更改该本地 FastAPI 的源码，由于它是通过 `-e` 安装的，当你再次运行那个 Python 文件，它将使用你刚刚编辑过的最新版本的 FastAPI。

这样，你不必再去重新"安装"你的本地版本即可测试所有更改。

/// note | "技术细节"

仅当你使用此项目中的 `requirements.txt` 安装而不是直接使用 `pip install fastapi` 安装时，才会发生这种情况。

这是因为在 `requirements.txt` 中，本地的 FastAPI 是使用“可编辑” （`-e`）选项安装的

///

### 格式化

你可以运行下面的脚本来格式化和清理所有代码：

**FastAPI** is helemaal gebaseerd op deze type hints, ze geven veel voordelen.

Maar zelfs als je **FastAPI** nooit gebruikt, heb je er baat bij om er iets over te leren.

/// note

Als je een Python expert bent en alles al weet over type hints, sla dan dit hoofdstuk over.

///

## Motivatie

Laten we beginnen met een eenvoudig voorbeeld:

```Python

    assertThat(Booleans.falseFirst().compare(true, false)).isGreaterThan(0);
  }

  public void testCompare() {
    for (boolean x : VALUES) {
      for (boolean y : VALUES) {
        // note: spec requires only that the sign is the same
        assertWithMessage(x + ", " + y)
            .that(Booleans.compare(x, y))
            .isEqualTo(Boolean.valueOf(x).compareTo(y));
      }
    }
  }

   *       List#add}, or functional update methods such as {@link
   *       com.google.common.base.Joiner#skipNulls}.
   * </ul>
   *
   * <p>Note that constructors taking a builder object cannot be tested effectively because
   * semantics of builder can be arbitrarily complex. Still, a factory class can be created in the
   * test to facilitate equality testing. For example:

    CANCEL`.
 *  New: Support OSGi metadata.
 *  Upgrade: [Okio 2.9.0][okio_2_9_0].

    ```kotlin
    implementation("com.squareup.okio:okio:2.9.0")
    ```

Note that this was originally released on 2020-10-06 as 4.10.0-RC1. The only change from that
release is the version name.


[Ktor]: https://ktor.io/
[assertk]: https://github.com/willowtreeapps/assertk

    }
    return (char) value;
  }

  /**
   * Compares the two specified {@code char} values. The sign of the value returned is the same as
   * that of {@code ((Character) a).compareTo(b)}.
   *
   * <p><b>Note:</b> this method is now unnecessary and should be treated as deprecated; use the
   * equivalent {@link Character#compare} method instead.
   *
   * @param a the first {@code char} to compare

@app.get("/")
async def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
async def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

**Note**:

잘 모르겠다면, <a href="https://fastapi.tiangolo.com/async/#in-a-hurry" target="_blank">문서에서 `async`와 `await`</a>에 관한 _"급하세요?"_ 섹션을 확인해 보십시오.

</details>

### 실행하기

서버를 실행하십시오:

<div class="termy">

**FastAPI** hoàn toàn được dựa trên những gợi ý kiểu dữ liệu, chúng mang đến nhiều ưu điểm và lợi ích.

Nhưng thậm chí nếu bạn không bao giờ sử dụng **FastAPI**, bạn sẽ được lợi từ việc học một ít về chúng.

/// note

Nếu bạn là một chuyên gia về Python, và bạn đã biết mọi thứ về gợi ý kiểu dữ liệu, bỏ qua và đi tới chương tiếp theo.

///

## Động lực

Hãy bắt đầu với một ví dụ đơn giản:

```Python

	"github.com/minio/mux"
	"github.com/minio/pkg/v3/policy"
	"github.com/minio/sio"
)

// Multipart objectAPIHandlers

// NewMultipartUploadHandler - New multipart upload.
// Notice: The S3 client can send secret keys in headers for encryption related jobs,
// the handler should ensure to remove these keys before sending them to the object layer.
// Currently these keys are: