### 在使用 `yield` 的依赖项中使用上下文管理器

/// warning | 注意

这是一个更为"高级"的想法。

如果你刚开始使用 **FastAPI** ，你可以暂时可以跳过它。

///

在Python中，你可以通过<a href="https://docs.python.org/3/reference/datamodel.html#context-managers" class="external-link" target="_blank">创建一个带有`__enter__()`和`__exit__()`方法的类</a>来创建上下文管理器。

你也可以在 **FastAPI** 的 `yield` 依赖项中通过 `with` 或者 `async with` 语句来使用它们：

```Python hl_lines="1-9  13"

    std::unique_ptr<TF_Status, decltype(&TF_DeleteStatus)> await_status(
        TF_NewStatus(), TF_DeleteStatus);
    // Wait until all pending nodes have completed since they may have a
    // reference to default_cancellation_manager_. We ignore the status return
    // since we already have a bad status to propagate.
    TFE_ContextAsyncWait(context, await_status.get());

- kube-apiserver: The `ResourceQuota` admission plugin configuration referenced from `--admission-control-config-file` admission config has been promoted to...

Now you can translate it all and see how it looks as you save the file.

#### Don't Translate these Pages

🚨 Don't translate:

* Files under `reference/`
* `release-notes.md`
* `fastapi-people.md`
* `external-links.md`
* `newsletter.md`
* `management-tasks.md`
* `management.md`

	case "line":
		in.line()
	case "undef":
		in.undef()
	default:
		in.Error("unexpected token after '#':", in.Stack.Text())
	}
	return true
}

// macroName returns the name for the macro being referenced.
func (in *Input) macroName() string {
	// We use the Stack's input method; no macro processing at this stage.
	tok := in.Stack.Next()
	if tok != scanner.Ident {
		in.expectText("expected identifier after # directive")

## when Chart is deployed
environment:
  ## Please refer for comprehensive list https://min.io/docs/minio/linux/reference/minio-server/minio-server.html
  ## MINIO_SUBNET_LICENSE: "License key obtained from https://subnet.min.io"
  ## MINIO_BROWSER: "off"

## The name of a secret in the same kubernetes namespace which contain secret values

- github.com/coredns/corefile-migration: [v1.0.21 → v1.0.24](https://github.com/coredns/corefile-migration/compare/v1.0.21...v1.0.24)
- github.com/distribution/reference: [v0.5.0 → v0.6.0](https://github.com/distribution/reference/compare/v0.5.0...v0.6.0)
- github.com/docker/docker: [v20.10.27+incompatible → v27.1.1+incompatible](https://github.com/docker/docker/compare/v20.10.27...v27.1.1)

affinity: {} ## Use this field to add environment variables relevant to MinIO server. These fields will be passed on to MinIO container(s) ## when Chart is deployed environment: ## Please refer for comprehensive list https://min.io/docs/minio/linux/reference/minio-server/minio-server.html ## MINIO_SUBNET_LICENSE: "License key obtained from https://subnet.min.io" ## MINIO_BROWSER: "off" ## The name of a secret in the same kubernetes namespace which contain secret values ## This can be useful for LDAP...

affinity: {} ## Use this field to add environment variables relevant to MinIO server. These fields will be passed on to MinIO container(s) ## when Chart is deployed environment: ## Please refer for comprehensive list https://min.io/docs/minio/linux/reference/minio-server/minio-server.html ## MINIO_SUBNET_LICENSE: "License key obtained from https://subnet.min.io" ## MINIO_BROWSER: "off" ## The name of a secret in the same kubernetes namespace which contain secret values ## This can be useful for LDAP...

affinity: {} ## Use this field to add environment variables relevant to MinIO server. These fields will be passed on to MinIO container(s) ## when Chart is deployed environment: ## Please refer for comprehensive list https://min.io/docs/minio/linux/reference/minio-server/minio-server.html ## MINIO_SUBNET_LICENSE: "License key obtained from https://subnet.min.io" ## MINIO_BROWSER: "off" ## The name of a secret in the same kubernetes namespace which contain secret values ## This can be useful for LDAP...