* Create a `main.py` file with:

```Python
from fastapi import FastAPI

app = FastAPI()


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


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

### Dockerfile { #dockerfile }

Now in the same project directory create a file `Dockerfile` with:

    retry_installcommand() {
      n=0
      while true; do
        #{install_command} $1 && break
        let n=n+1
        if [ $n -ge $2 ]; then
          echo "==> Exhausted retries to install $1"
          return 1
        fi
        echo "==> Retrying installing $1, attempt $((n+1))"
        # Add a small delay to increase chance of metalink providing updated list of mirrors
        sleep 5
      done
    }

    public ExtractData getText(final InputStream inputStream, final Map<String, String> params) {
        // Custom extraction logic
        ExtractData extractData = new ExtractData();
        // ... implementation
        return extractData;
    }
}

// Register custom extractor
container.singleton("customExtractor", CustomExtractor.class);
container.singleton("extractorFactory", ExtractorFactory.class, factory -> {

        // Then
        verify(nextMessage).setTreeId(Smb2Constants.UNSPECIFIED_TREEID);
        assertTrue(result); // Assuming superclass chain returns true
    }

    @Test
    @DisplayName("Should always return 0 for readBytesWireFormat")
    void testReadBytesWireFormat() {
        // Given
        byte[] buffer = createTestData(256);

        // When
        int bytesRead = request.readBytesWireFormat(buffer, 0);

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

/// note | 참고

차이점을 모르겠다면 [Async: *"바쁘신 경우"*](../async.md#in-a-hurry)를 확인하세요.

///

### 5 단계: 콘텐츠 반환 { #step-5-return-the-content }

{* ../../docs_src/first_steps/tutorial001_py310.py hl[8] *}

`dict`, `list`, 단일값을 가진 `str`, `int` 등을 반환할 수 있습니다.

Pydantic 모델을 반환할 수도 있습니다(나중에 더 자세히 살펴봅니다).

	})
}

func writeTestsToFS(tests []WriteTest) fs.FS {
	fsys := fstest.MapFS{}
	for _, wt := range tests {
		fsys[wt.Name] = &fstest.MapFile{
			Data: wt.Data,
			Mode: wt.Mode,
		}
	}
	return fsys
}

func TestWriterAddFS(t *testing.T) {
	buf := new(bytes.Buffer)
	w := NewWriter(buf)
	tests := []WriteTest{
		{Name: "emptyfolder", Mode: 0o755 | os.ModeDir},

{* ../../docs_src/path_params/tutorial005_py310.py hl[20] *}

/// tip

你也可以用 `ModelName.lenet.value` 取得值 `"lenet"`。

///

#### 回傳「列舉成員」 { #return-enumeration-members }

你可以從「路徑操作」回傳「列舉成員」，即使是巢狀在 JSON 主體（例如 `dict`）裡。

在回傳給用戶端之前，它們會被轉成對應的值（此例為字串）：

{* ../../docs_src/path_params/tutorial005_py310.py hl[18,21,23] *}

你的用戶端會收到像這樣的 JSON 回應：

/// note | Not

Eğer farkı bilmiyorsanız, [Async: *"Aceleniz mi var?"*](../async.md#in-a-hurry) sayfasına bakın.

///

### Adım 5: içeriği döndürün { #step-5-return-the-content }

{* ../../docs_src/first_steps/tutorial001_py310.py hl[8] *}

Bir `dict`, `list`, `str`, `int` vb. tekil değerler döndürebilirsiniz.

编写带有类型标注的标准 Python：

```Python
from datetime import date

from pydantic import BaseModel

# 将变量声明为 str
# 并在函数内获得编辑器支持
def main(user_id: str):
    return user_id


# 一个 Pydantic 模型
class User(BaseModel):
    id: int
    name: str
    joined: date
```

可以像这样来使用：

```Python
my_user: User = User(id=3, name="John Doe", joined="2018-07-19")

/// note | Примечание

Если вы не знаете, в чём разница, посмотрите [Асинхронность: *"Нет времени?"*](../async.md#in-a-hurry).

///

### Шаг 5: верните содержимое { #step-5-return-the-content }

{* ../../docs_src/first_steps/tutorial001_py310.py hl[8] *}

Вы можете вернуть `dict`, `list`, отдельные значения `str`, `int` и т.д.

Также можно вернуть модели Pydantic (подробнее об этом позже).