* 建立一個 `app` 目錄並進入。
* 建立一個空的 `__init__.py` 檔案。
* 建立一個 `main.py` 檔案，內容如下：

```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 }

# Aider FastAPI - Obtenir de l'aide { #help-fastapi-get-help }

Aimez-vous **FastAPI** ?

Souhaitez-vous aider FastAPI, les autres utilisateurs et l'auteur ?

Ou souhaitez-vous obtenir de l'aide avec **FastAPI** ?

Il existe des moyens très simples d'aider (plusieurs ne nécessitent qu'un ou deux clics).

Et il existe aussi plusieurs façons d'obtenir de l'aide.

## S'abonner à la newsletter { #subscribe-to-the-newsletter }

    for (double value : MANY_VALUES) {
      manyValuesAccumulatorByRepeatedAdd.add(value);
    }

    manyValuesAccumulatorByAddAndAddAll = new StatsAccumulator();
    manyValuesAccumulatorByAddAndAddAll.add(MANY_VALUES.get(0));
    manyValuesAccumulatorByAddAndAddAll.addAll(MANY_VALUES.subList(1, MANY_VALUES.size()));

    manyValuesAccumulatorByAddAllStats = new StatsAccumulator();
    manyValuesAccumulatorByAddAllStats.addAll(

`response_model`パラメータは、いずれの *path operation* でも使用できます:

* `@app.get()`
* `@app.post()`
* `@app.put()`
* `@app.delete()`
* など。

{* ../../docs_src/response_model/tutorial001_py310.py hl[17,22,24:27] *}

/// note | 備考

`response_model`は「デコレータ」メソッド（`get`、`post`など）のパラメータです。関数のパラメータやボディなどとは違い、*path operation 関数*のパラメータではありません。

///

        // List empty directory
        String[] files = checkDir.list();
        assertNotNull(files, "List should not be null");
        assertEquals(0, files.length, "Empty directory should have no files");

        // Get directory size (should be 0 for directories)
        assertEquals(0, checkDir.length(), "Directory length should be 0");
        checkDir.close();

        // Delete empty directory with fresh context

      stack.addLast(top);

      N node = top.node;
      N previousNode = prev == null ? null : prev.node;
      if (top.remainingSuccessors == null) {
        NodeVisitState state = visitedNodes.get(node);
        if (state == NodeVisitState.COMPLETE) {
          stack.removeLast();
          continue;
        }
        if (state == NodeVisitState.PENDING) {
          return true;
        }

{* ../../docs_src/bigger_applications/app_an_py310/routers/items.py hl[5:10,16,21] title["app/routers/items.py"] *}

Da der Pfad jeder *Pfadoperation* mit `/` beginnen muss, wie in:

```Python hl_lines="1"
@router.get("/{item_id}")
async def read_item(item_id: str):
    ...
```

... darf das Präfix kein abschließendes `/` enthalten.

Das Präfix lautet in diesem Fall also `/items`.

    // Make sure it returned a copy
    list.set(0, (int) 4);
    assertThat(newArray).isEqualTo(new int[] {(int) 0, (int) 1, (int) 2});
    newArray[1] = (int) 5;
    assertThat((int) list.get(1)).isEqualTo((int) 1);
  }

  // This test stems from a real bug found by andrewk
  public void testAsList_subList_toArray_roundTrip() {
    int[] array = {(int) 0, (int) 1, (int) 2, (int) 3};

    // Make sure it returned a copy
    list.set(0, (char) 4);
    assertThat(newArray).isEqualTo(new char[] {(char) 0, (char) 1, (char) 2});
    newArray[1] = (char) 5;
    assertThat((char) list.get(1)).isEqualTo((char) 1);
  }

  // This test stems from a real bug found by andrewk
  public void testAsList_subList_toArray_roundTrip() {
    char[] array = {(char) 0, (char) 1, (char) 2, (char) 3};

* `app` 디렉터리를 만들고 들어갑니다.
* 빈 파일 `__init__.py`를 만듭니다.
* 다음 내용으로 `main.py` 파일을 만듭니다:

```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 }