* In requests and responses will be represented as a `float` of total seconds.
    * Pydantic also allows representing it as a "ISO 8601 time diff encoding", [see the docs for more info](https://docs.pydantic.dev/latest/concepts/serialization/#custom-serializers).
* `frozenset`:
    * In requests and responses, treated the same as a `set`:
        * In requests, a list will be read, eliminating duplicates and converting it to a `set`.

## 2. Create Kubernetes secret

[Kubernetes secrets](https://kubernetes.io/docs/concepts/configuration/secret) are intended to hold sensitive information.
We'll use secrets to hold the TLS certificate and key. To create a secret, update the paths to `private.key` and `public.crt`
below.

Then type

```sh

import org.apache.maven.artifact.versioning.OverConstrainedVersionException;
import org.apache.maven.artifact.versioning.VersionRange;

/**
 * Maven Artifact interface. Notice that it mixes artifact definition concepts (groupId, artifactId, version)
 * with dependency information (version range, scope).
 */
public interface Artifact extends Comparable<Artifact> {

    @Deprecated(since = "4.0.0")
    String RELEASE_VERSION = "RELEASE";

Instance is now accessible on the host at port 9000, proceed to access the Web browser at <http://127.0.0.1:9000/>

## Explore Further

- [MinIO Erasure Code Overview](https://docs.min.io/community/minio-object-store/operations/concepts/erasure-coding.html)
- [Use `mc` with MinIO Server](https://docs.min.io/community/minio-object-store/reference/minio-mc.html)

這表示在 Python 中自環境變數讀取到的任何值都會是 `str`，而任何轉型成其他型別或驗證都必須在程式碼中完成。

## Pydantic `Settings` { #pydantic-settings }

幸好，Pydantic 提供了很好的工具，可用來處理由環境變數而來的設定：[Pydantic：設定管理](https://docs.pydantic.dev/latest/concepts/pydantic_settings/)。

### 安裝 `pydantic-settings` { #install-pydantic-settings }

首先，請先建立你的[虛擬環境](../virtual-environments.md)，啟用它，然後安裝 `pydantic-settings` 套件：

<div class="termy">

```console

* `datetime.timedelta`：
    * Python 的 `datetime.timedelta`。
    * 在請求與回應中會以總秒數的 `float` 表示。
    * Pydantic 也允許用「ISO 8601 time diff encoding」來表示，[詳情見文件](https://docs.pydantic.dev/latest/concepts/serialization/#custom-serializers)。
* `frozenset`：
    * 在請求與回應中與 `set` 相同處理：
        * 在請求中，會讀取一個 list，去除重複並轉為 `set`。
        * 在回應中，`set` 會被轉為 `list`。
        * 生成的 schema 會指定 `set` 的值為唯一（使用 JSON Schema 的 `uniqueItems`）。

* `datetime.timedelta`:
    * 一个 Python `datetime.timedelta`.
    * 在请求和响应中将表示为 `float` 代表总秒数。
    * Pydantic 也允许将其表示为 "ISO 8601 时间差异编码", [查看文档了解更多信息](https://docs.pydantic.dev/latest/concepts/serialization/#custom-serializers)。
* `frozenset`:
    * 在请求和响应中，作为 `set` 对待：
        * 在请求中，列表将被读取，消除重复，并将其转换为一个 `set`。
        * 在响应中 `set` 将被转换为 `list` 。
        * 产生的模式将指定那些 `set` 的值是唯一的 (使用 JSON Schema 的 `uniqueItems`)。

* [MinIO Erasure Code QuickStart Guide](https://docs.min.io/community/minio-object-store/operations/concepts/erasure-coding.html)...

```

See <https://docs.aws.amazon.com/AmazonS3/latest/dev/object-lock-overview.html> for AWS S3 spec on object locking and permissions required for specifying legal hold.

## Concepts

- If an object is under legal hold, it cannot be deleted unless the legal hold is explicitly removed for the respective version id. DeleteObjectVersion() would fail otherwise.

///

## Advanced User Guide { #advanced-user-guide }

There is also an **Advanced User Guide** that you can read later after this **Tutorial - User guide**.

The **Advanced User Guide** builds on this one, uses the same concepts, and teaches you some extra features.

But you should first read the **Tutorial - User Guide** (what you are reading right now).