### 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());

            .add(Range.openClosed(3, 4))
            .add(Range.open(8, 10))
            .add(Range.openClosed(15, 17))
            .build();

    assertThat(RANGE_SET_ONE.difference(RANGE_SET_TWO)).isEqualTo(expected);
  }

  public void testAsSet() {
    ImmutableSortedSet<Integer> expectedSet = ImmutableSortedSet.of(2, 3, 4, 8, 9, 16, 17);

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`

				bucketsToBeUpdated.Add(bucket)
				continue
			}
			if !globalDomainIPs.Intersection(set.CreateStringSet(getHostsSlice(r)...)).IsEmpty() {
				if globalDomainIPs.Difference(set.CreateStringSet(getHostsSlice(r)...)).IsEmpty() && !domainMissing {
					// No difference in terms of domainIPs and nothing
					// has changed so we don't change anything on the etcd.
					//
					// Additionally also check if domain is updated/missing with more

   * {@linkplain Cache#invalidate invalidations}.
   */
  public long evictionCount() {
    return evictionCount;
  }

  /**
   * Returns a new {@code CacheStats} representing the difference between this {@code CacheStats}
   * and {@code other}. Negative values, which aren't supported by {@code CacheStats} will be
   * rounded up to zero.
   */
  public CacheStats minus(CacheStats other) {

   * {@linkplain Cache#invalidate invalidations}.
   */
  public long evictionCount() {
    return evictionCount;
  }

  /**
   * Returns a new {@code CacheStats} representing the difference between this {@code CacheStats}
   * and {@code other}. Negative values, which aren't supported by {@code CacheStats} will be
   * rounded up to zero.
   */
  public CacheStats minus(CacheStats other) {

## 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

	policiesToUpdate := set.CreateStringSet(policies...)
	var newPolicySet set.StringSet
	newPolicyMapping := mp
	if isAttach {
		// new policies to attach => inputPolicies - existing (set difference)
		policiesToUpdate = policiesToUpdate.Difference(existingPolicySet)
		// validate that new policies to add are defined.
		for _, p := range policiesToUpdate.ToSlice() {
			if _, found := cache.iamPolicyDocsMap[p]; !found {

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...