from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    description: Union[str, None] = None
    price: float
    tax: Union[float, None] = None
    tags: set[str] = set()


@app.put("/items/{item_id}")
async def update_item(item_id: int, item: Item):
    results = {"item_id": item_id, "item": item}

  }

  public void testAsSet_present() {
    Set<String> expected = Collections.singleton("a");
    assertEquals(expected, Optional.of("a").asSet());
  }

  public void testAsSet_absent() {
    assertTrue("Returned set should be empty", Optional.absent().asSet().isEmpty());
  }

  public void testAsSet_presentIsImmutable() {
    Set<String> presentAsSet = Optional.of("a").asSet();

var ErrInvalidChecksum = errors.New("invalid checksum")

// SetExpectedMin set expected minimum data expected from reader
func (r *Reader) SetExpectedMin(expectedMin int64) {
	r.expectedMin = expectedMin
}

// SetExpectedMax set expected max data expected from reader
func (r *Reader) SetExpectedMax(expectedMax int64) {
	r.expectedMax = expectedMax
}

    subList.set(0, e3());
    List<E> expected = copyToList(createSamplesArray());
    expected.set(0, e3());
    expectContents(expected);
  }

  @ListFeature.Require(SUPPORTS_SET)
  @CollectionSize.Require(absent = ZERO)
  public void testSubList_originalListSetAffectsSubList() {
    List<E> subList = getList().subList(0, 1);
    getList().set(0, e3());
    assertEquals(

    subList.set(0, e3());
    List<E> expected = copyToList(createSamplesArray());
    expected.set(0, e3());
    expectContents(expected);
  }

  @ListFeature.Require(SUPPORTS_SET)
  @CollectionSize.Require(absent = ZERO)
  public void testSubList_originalListSetAffectsSubList() {
    List<E> subList = getList().subList(0, 1);
    getList().set(0, e3());
    assertEquals(

```Python hl_lines="31  37"
{!../../docs_src/response_model/tutorial005.py!}
```

/// tip | "팁"

문법 `{"name", "description"}`은 두 값을 갖는 `set`을 만듭니다.

이는 `set(["name", "description"])`과 동일합니다.

///

#### `set` 대신 `list` 사용하기

`list` 또는 `tuple` 대신 `set`을 사용하는 법을 잊었더라도, FastAPI는 `set`으로 변환하고 정상적으로 작동합니다:

```Python hl_lines="31  37"
{!../../docs_src/response_model/tutorial006.py!}
```

## 요약

                  @Override
                  protected List<String> create(String[] elements) {
                    Set<String> set = new HashSet<>();
                    ImmutableMultiset.Builder<String> builder = ImmutableMultiset.builder();
                    for (String s : elements) {
                      checkArgument(set.add(s));
                      builder.addCopies(s, 2);
                    }

class Image(BaseModel):
    url: HttpUrl
    name: str


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


@app.put("/items/{item_id}")
async def update_item(item_id: int, item: Item):
    results = {"item_id": item_id, "item": item}

```

////

/// tip

The syntax `{"name", "description"}` creates a `set` with those two values.

It is equivalent to `set(["name", "description"])`.

///

#### Using `list`s instead of `set`s

If you forget to use a `set` and use a `list` or `tuple` instead, FastAPI will still convert it to a `set` and it will work correctly:

//// tab | Python 3.10+

```Python hl_lines="29  35"

     * Used to update and read the latestTaskQueue field. Set to null once the runnable has been run
     * or queued.
     */
    @CheckForNull ExecutionSequencer sequencer;

    /**
     * Executor the task was set to run on. Set to null when the task has been queued, run, or
     * cancelled.
     */
    @CheckForNull Executor delegate;

    /**