/**
 * A ScheduledExecutorService that executes all scheduled actions immediately in the calling thread.
 *
 * <p>See {@link TestingExecutors#sameThreadScheduledExecutor()} for a full list of constraints.
 *
 * @author John Sirois
 * @author Zach van Schouwen
 */
@GwtIncompatible
class SameThreadScheduledExecutorService extends AbstractExecutorService
    implements ListeningScheduledExecutorService {

* The Certificates API has graduated from alpha to beta. This is a backwards-incompatible change since the alpha support is dropped, and therefore kubeadm v1.5 and v1.6 don't work together (for example kubeadm v1.5 can't join a kubeadm v1.6 cluster).
* Supporting only etcd3, with 3.0.14 as the minimum version.

/// note | "참고"

파이썬에 능숙하셔서 타입 힌트에 대해 모두 아신다면, 다음 챕터로 건너뛰세요.

///

## 동기 부여

간단한 예제부터 시작해봅시다:

```Python
{!../../docs_src/python_types/tutorial001.py!}
```

이 프로그램을 실행한 결과값:

```
John Doe
```

함수는 아래와 같이 실행됩니다:

* `first_name`과 `last_name`를 받습니다.
* `title()`로 각 첫 문자를 대문자로 변환시킵니다.
* 두 단어를 중간에 공백을 두고 <abbr title="두 개를 하나로 차례차례 이어지게 하다">연결</abbr>합니다.

```Python hl_lines="2"

        "/users/me", headers={"Authorization": f"Bearer {access_token}"}
    )
    assert response.status_code == 200, response.text
    assert response.json() == {
        "username": "johndoe",
        "full_name": "John Doe",
        "email": "******@****.***",
        "disabled": False,
    }


@needs_py39
def test_incorrect_token(client: TestClient):

/// note

🚥 👆 🐍 🕴, & 👆 ⏪ 💭 🌐 🔃 🆎 🔑, 🚶 ⏭ 📃.

///

## 🎯

➡️ ▶️ ⏮️ 🙅 🖼:

```Python
{!../../docs_src/python_types/tutorial001.py!}
```

🤙 👉 📋 🔢:

```
John Doe
```

🔢 🔨 📄:

* ✊ `first_name` & `last_name`.
* 🗜 🥇 🔤 🔠 1️⃣ ↖ 💼 ⏮️ `title()`.
* <abbr title="Puts them together, as one. With the contents of one after the other.">🔢</abbr> 👫 ⏮️ 🚀 🖕.

//
// Note that returning an error here will cause the Metrics handler to return a
// 500 Internal Server Error.
type MetricsLoaderFn func(context.Context, MetricValues, *metricsCache) error

// JoinLoaders - joins multiple loaders into a single loader. The returned
// loader will call each of the given loaders in order. If any of the loaders
// return an error, the returned loader will return that error.

### 🤚 👆 👍 👩‍💻 💽

🔜 ⚙️ 🛠️ `GET` ⏮️ ➡ `/users/me`.

👆 🔜 🤚 👆 👩‍💻 📊, 💖:

```JSON
{
  "username": "johndoe",
  "email": "******@****.***",
  "full_name": "John Doe",
  "disabled": false,
  "hashed_password": "fakehashedsecret"
}
```

<img src="/img/tutorial/security/image06.png">

🚥 👆 🖊 🔒 ℹ &amp; ⏏, &amp; ⤴️ 🔄 🎏 🛠️ 🔄, 👆 🔜 🤚 🇺🇸🔍 4️⃣0️⃣1️⃣ ❌:

        "/users/me", headers={"Authorization": f"Bearer {access_token}"}
    )
    assert response.status_code == 200, response.text
    assert response.json() == {
        "username": "johndoe",
        "full_name": "John Doe",
        "email": "******@****.***",
        "disabled": False,
    }


def test_incorrect_token():
    response = client.get("/users/me", headers={"Authorization": "Bearer nonexistent"})

        "/users/me", headers={"Authorization": f"Bearer {access_token}"}
    )
    assert response.status_code == 200, response.text
    assert response.json() == {
        "username": "johndoe",
        "full_name": "John Doe",
        "email": "******@****.***",
        "disabled": False,
    }


def test_incorrect_token():
    response = client.get("/users/me", headers={"Authorization": "Bearer nonexistent"})

///

<img src="/img/tutorial/security/image08.png">

🤙 🔗 `/users/me/`, 👆 🔜 🤚 📨:

```JSON
{
  "username": "johndoe",
  "email": "******@****.***",
  "full_name": "John Doe",
  "disabled": false
}
```

<img src="/img/tutorial/security/image09.png">

🚥 👆 📂 👩‍💻 🧰, 👆 💪 👀 ❔ 📊 📨 🕴 🔌 🤝, 🔐 🕴 📨 🥇 📨 🔓 👩‍💻 &amp; 🤚 👈 🔐 🤝, ✋️ 🚫 ⏮️: