{!> ../../../docs_src/path_operation_configuration/tutorial003_py310.py!}
    ```

=== "Python 3.9+"

    ```Python hl_lines="20-21"
    {!> ../../../docs_src/path_operation_configuration/tutorial003_py39.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="20-21"
    {!> ../../../docs_src/path_operation_configuration/tutorial003.py!}
    ```

## Описание из строк документации

// license that can be found in the LICENSE file.

//go:build goexperiment.arenas

package arena_test

import (
	"arena"
	"testing"
)

type T1 struct {
	n int
}
type T2 [1 << 20]byte // 1MiB

func TestSmoke(t *testing.T) {
	a := arena.NewArena()
	defer a.Free()

	tt := arena.New[T1](a)
	tt.n = 1

	ts := arena.MakeSlice[T1](a, 99, 100)
	if len(ts) != 99 {

	_ = x[rebalStarted-1]
	_ = x[rebalCompleted-2]
	_ = x[rebalStopped-3]
	_ = x[rebalFailed-4]
}

const _rebalStatus_name = "NoneStartedCompletedStoppedFailed"

var _rebalStatus_index = [...]uint8{0, 4, 11, 20, 27, 33}

func (i rebalStatus) String() string {
	if i >= rebalStatus(len(_rebalStatus_index)-1) {
		return "rebalStatus(" + strconv.FormatInt(int64(i), 10) + ")"
	}

#include "_cgo_export.h"

static void*
addThread(void *p)
{
	int i, max;
	
	max = *(int*)p;
	for(i=0; i<max; i++)
		Add(i);
	return 0;
}

void
doAdd(int max, int nthread)
{
	enum { MaxThread = 20 };
	int i;
	pthread_t thread_id[MaxThread];
	
	if(nthread > MaxThread)
		nthread = MaxThread;
	for(i=0; i<nthread; i++)
		pthread_create(&thread_id[i], 0, addThread, &max);
	for(i=0; i<nthread; i++)

```

Sería lo mismo que ir a:

```
http://127.0.0.1:8000/items/?skip=0&limit=10
```

Pero, si por ejemplo vas a:

```
http://127.0.0.1:8000/items/?skip=20
```

Los valores de los parámetros en tu función serán:

* `skip=20`: porque lo definiste en la URL
* `limit=10`: porque era el valor por defecto

## Parámetros opcionales

=== "Python 3.10+"

    ```Python hl_lines="18-20"
    {!> ../../../docs_src/body_multiple_params/tutorial001_an_py310.py!}
    ```

=== "Python 3.9+"

    ```Python hl_lines="18-20"
    {!> ../../../docs_src/body_multiple_params/tutorial001_an_py39.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="19-21"

    mmHeap.addAll(Lists.newArrayList(1, 20, 100, 2, 3, 30, 40));
    assertEquals(7, mmHeap.size());
    assertTrue("Heap is not intact initially", mmHeap.isIntact());
    Iterator<Integer> it = mmHeap.iterator();
    assertEquals((Integer) 1, it.next());
    assertEquals((Integer) 20, it.next());
    assertEquals((Integer) 100, it.next());
    assertEquals((Integer) 2, it.next());

```
http://127.0.0.1:8000/items/
```

아래로 이동하는 것과 같습니다:

```
http://127.0.0.1:8000/items/?skip=0&limit=10
```

하지만 가령 아래로 이동한 경우:

```
http://127.0.0.1:8000/items/?skip=20
```

함수의 매개변수 값은 아래가 됩니다:

* `skip=20`: URL에서 지정했기 때문입니다
* `limit=10`: 기본값이기 때문입니다

## 선택적 매개변수

같은 방법으로 기본값을 `None`으로 설정하여 선택적 매개변수를 선언할 수 있습니다:

```Python hl_lines="9"
{!../../../docs_src/query_params/tutorial002.py!}

访问 URL：

```
http://127.0.0.1:8000/items/
```

与访问以下地址相同：

```
http://127.0.0.1:8000/items/?skip=0&limit=10
```

但如果访问：

```
http://127.0.0.1:8000/items/?skip=20
```

查询参数的值就是：

* `skip=20`：在 URL 中设定的值
* `limit=10`：使用默认值

## 可选参数

同理，把默认值设为 `None` 即可声明**可选的**查询参数：

=== "Python 3.10+"

    ```Python hl_lines="7"

  public void testAutoIncrementStep_nanos() {
    FakeTicker ticker = new FakeTicker().setAutoIncrementStep(10, TimeUnit.NANOSECONDS);
    assertEquals(0, ticker.read());
    assertEquals(10, ticker.read());
    assertEquals(20, ticker.read());
  }

  public void testAutoIncrementStep_millis() {
    FakeTicker ticker = new FakeTicker().setAutoIncrementStep(1, TimeUnit.MILLISECONDS);
    assertEquals(0, ticker.read());