name: str
    description: Union[str, None] = Field(
        default=None, title="The description of the item", max_length=300
    )
    price: float = Field(gt=0, description="The price must be greater than zero")
    tax: Union[float, None] = None


@app.put("/items/{item_id}")
async def update_item(item_id: int, item: Annotated[Item, Body(embed=True)]):
    results = {"item_id": item_id, "item": item}

                }
            },
        },
    },
)
async def read_item(item_id: str):
    if item_id == "foo":
        return {"id": "foo", "value": "there goes my hero"}
    else:

Se você utiliza uma versão anterior, ocorrerão erros ao tentar utilizar `Annotated`.

Certifique-se de [Atualizar a versão do FastAPI](../../deployment/versions.md#atualizando-as-versoes-do-fastapi){.internal-link target=_blank} para pelo menos 0.95.1 antes de usar `Annotated`.

///

### Importando `Depends`

//// tab | Python 3.10+

```Python hl_lines="3"
{!> ../../docs_src/dependencies/tutorial001_an_py310.py!}
```

	c := make(chan ioret[V], 1)
	go func() {
		v, err := work(ctx)
		c <- ioret[V]{val: v, err: err}
	}()

	select {
	case v := <-c:
		return v.val, v.err
	case <-ctx.Done():
		var zero V
		return zero, ctx.Err()
	}
}

// DeadlineWorker implements the deadline/timeout resiliency pattern.
type DeadlineWorker struct {
	timeout time.Duration
}

   * happens when an {@link AtomicInteger#compareAndSet} fails, but we can simulate the case where
   * the putIfAbsent returns a non-null value, and the case where the replace() of an observed zero
   * fails.
   */
  public void testAdd_withFailures() {
    AtomicInteger existing = new AtomicInteger(12);
    AtomicInteger existingZero = new AtomicInteger(0);

    // initial map.get()

labels.searchlog_log_type_favorite=Favorite Log
labels.searchlog_log_type_user_info=User Information
labels.searchlog_log_type_search_keyword=Keywords
labels.searchlog_log_type_search_zerohit=Zero Hits
labels.searchlog_log_type_search_zeroclick=Zero Clicks
labels.searchlog_log_type_search_count_hour=Keyword by Hour
labels.searchlog_log_type_search_count_day=Keyword by Day
labels.searchlog_log_type_search_user_hour=User by Hour

						v = v.Elem()
					} else {
						return nil, true
					}
				}
			}

			fv, zero := v.Interface(), v.IsZero()
			return fv, zero
		}
	}

	if field.Serializer != nil {
		oldValuerOf := field.ValueOf
		field.ValueOf = func(ctx context.Context, v reflect.Value) (interface{}, bool) {
			value, zero := oldValuerOf(ctx, v)

			s, ok := value.(SerializerValuerInterface)
			if !ok {

	h, err := FileInfoHeader(fi, "")
	if err != nil {
		t.Fatalf("FileInfoHeader: %v", err)
	}
	if g, e := h.Name, "small.txt"; g != e {
		t.Errorf("Name = %q; want %q", g, e)
	}
	if g, e := h.Mode, int64(fi.Mode().Perm()); g != e {
		t.Errorf("Mode = %#o; want %#o", g, e)
	}
	if g, e := h.Size, int64(5); g != e {
		t.Errorf("Size = %v; want %v", g, e)
	}
	if g, e := h.ModTime, fi.ModTime(); !g.Equal(e) {

@needs_py39
def test_get_items(client: TestClient):
    response = client.get("/items/")
    assert response.status_code == 200, response.text
    assert response.json() == [
        {"name": "Foo", "description": "There comes my hero"},
        {"name": "Red", "description": "It's my aeroplane"},
    ]


@needs_py39
def test_openapi_schema(client: TestClient):
    response = client.get("/openapi.json")

	if err == io.EOF && size != 0 {
		err = io.ErrUnexpectedEOF
	}
	if err != nil && err != io.EOF {
		cr.err = err
		return n, cr.err
	}

	// If the chunk size is zero we return io.EOF. As specified by AWS,
	// only the last chunk is zero-sized.
	if len(cr.buffer) == 0 {
		if cr.debug {
			fmt.Println("EOF")
		}
		if cr.trailers != nil {
			err = cr.readTrailers()
			if cr.debug {