password_hash = PasswordHash.recommended()

DUMMY_HASH = password_hash.hash("dummypassword")

oauth2_scheme = OAuth2PasswordBearer(
    tokenUrl="token",
    scopes={"me": "Read information about the current user.", "items": "Read items."},
)

app = FastAPI()


def verify_password(plain_password, hashed_password):
    return password_hash.verify(plain_password, hashed_password)


def get_password_hash(password):

运行示例并访问 [http://127.0.0.1:8000/items/3](http://127.0.0.1:8000/items/3)，返回的响应如下：

```JSON
{"item_id":3}
```

/// check | 检查

注意，函数接收并返回的值是 `3`（ `int`），不是 `"3"`（`str`）。

**FastAPI** 通过类型声明自动进行请求的<dfn title="将来自 HTTP 请求中的字符串转换为 Python 数据类型">解析</dfn>。

///

## 数据校验 { #data-validation }

通过浏览器访问 [http://127.0.0.1:8000/items/foo](http://127.0.0.1:8000/items/foo)，接收如下 HTTP 错误信息：

```JSON
{

	</div>
	<div class="offcanvas-body">
		<c:forEach var="fieldData" items="${facetResponse.fieldList}">
			<c:if test="${fieldData.name == 'label' && fieldData.valueCountMap.size() > 0}">
				<ul class="list-group mb-2">
					<li class="list-group-item text-uppercase"><la:message key="labels.facet_label_title" /></li>
					<c:forEach var="countEntry" items="${fieldData.valueCountMap}">

Відкрийте браузер і перейдіть на [http://127.0.0.1:8000/items/5?q=somequery](http://127.0.0.1:8000/items/5?q=somequery).

Ви побачите JSON-відповідь:

```JSON
{"item_id": 5, "q": "somequery"}
```

Ви вже створили API, який:

* Отримує HTTP-запити за _шляхами_ `/` та `/items/{item_id}`.
* Обидва _шляхи_ приймають `GET` операції (також відомі як HTTP _методи_).

    }

    @Test
    public void test_writeMultipleItems() throws Exception {
        SuggestItem[] items = new SuggestItem[3];
        for (int i = 0; i < 3; i++) {
            String[][] readings = new String[1][];
            readings[0] = new String[] { "test" + i };
            items[i] = new SuggestItem(new String[] { "テスト" + i }, readings, new String[] { "content" }, 1, 0, -1, new String[] { "tag1" },

For example, let's say that you want to have a *path operation* that allows to update items, and returns HTTP status codes of 200 "OK" when successful.

But you also want it to accept new items. And when the items didn't exist before, it creates them, and returns an HTTP status code of 201 "Created".

from fastapi import FastAPI
from fastapi.testclient import TestClient

swagger_ui_oauth2_redirect_url = "/docs/redirect"

app = FastAPI(swagger_ui_oauth2_redirect_url=swagger_ui_oauth2_redirect_url)


@app.get("/items/")
async def read_items():
    return {"id": "foo"}


client = TestClient(app)


def test_swagger_ui():
    response = client.get("/docs")
    assert response.status_code == 200, response.text

        // Test sequential ID assignment pattern
        TestDictionaryItem[] items = new TestDictionaryItem[5];

        for (int i = 0; i < items.length; i++) {
            items[i] = new TestDictionaryItem();
            items[i].id = i + 1;
        }

        for (int i = 0; i < items.length; i++) {
            assertEquals(i + 1, items[i].getId());
        }
    }

    @Test

class Item(BaseModel):
    name: str
    description: str | None = None
    price: float
    tax: float | None = None
    tags: list[str] = []


@app.post("/items/")
async def create_item(item: Item) -> Item:
    return item


@app.get("/items/")
async def read_items() -> list[Item]:
    return [
        Item(name="Portal Gun", price=42.0),
        Item(name="Plumbus", price=32.0),

    """Test that serialize_sequence_value handles optional lists correctly."""
    from fastapi._compat import v2

    field_info = FieldInfo(annotation=list[str] | None)
    field = v2.ModelField(name="items", field_info=field_info)
    result = v2.serialize_sequence_value(field=field, value=["a", "b", "c"])
    assert result == ["a", "b", "c"]
    assert isinstance(result, list)