## Kontextmanager

### Was sind „Kontextmanager“

// Network Policy List is a list of NetworkPolicy objects.
message NetworkPolicyList {
  // Standard list metadata.
  // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 1;

  // Items is a list of schema objects.
  repeated NetworkPolicy items = 2;
}

```Python hl_lines="2  14"
{!../../../docs_src/custom_response/tutorial007.py!}
```

#### Using `StreamingResponse` with file-like objects

If you have a file-like object (e.g. the object returned by `open()`), you can create a generator function to iterate over that file-like object.

That way, you don't have to read it all first in memory, and you can pass that generator function to the `StreamingResponse`, and return it.

  // Must match in order to be controlled.
  // It must match the pod template's labels.
  // More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#label-selectors
  optional k8s.io.apimachinery.pkg.apis.meta.v1.LabelSelector selector = 1;

  // An object that describes the pod that will be created.
  // The DaemonSet will create exactly one copy of this pod on every node

}

// CertificateSigningRequestList is a collection of CertificateSigningRequest objects
message CertificateSigningRequestList {
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 1;

  // items is a collection of CertificateSigningRequest objects
  repeated CertificateSigningRequest items = 2;
}

// CertificateSigningRequestSpec contains the certificate request.

از جمله کتابخانه های خارجی نیز مبتنی بر Pydantic میتوان به <abbr title="Object-Relational Mapper">ORM</abbr> و <abbr title="Object-Document Mapper">ODM</abbr> ها برای دیتابیس ها اشاره کرد.

We don't pass a `db` attribute around. Instead we use the models directly. This is because the `db` object is a global object, that includes all the connection logic. That's why we had to do all the `contextvars` updates above.

Aso, when returning several objects, like in `get_users`, we directly call `list`, like in:

```Python
list(models.User.select())
```

      tag = 5L,
      codec =
        object : BasicDerAdapter.Codec<Unit?> {
          override fun decode(reader: DerReader): Unit? = null

          override fun encode(
            writer: DerWriter,
            value: Unit?,
          ) {
          }
        },
    )

  val OBJECT_IDENTIFIER =
    BasicDerAdapter(
      name = "OBJECT IDENTIFIER",

        ObjectIdentifiers.RSA_ENCRYPTION -> Adapters.NULL
        ObjectIdentifiers.EC_PUBLIC_KEY -> Adapters.OBJECT_IDENTIFIER
        else -> null
      }
    }

  /**
   * ```
   * AlgorithmIdentifier ::= SEQUENCE  {
   *   algorithm      OBJECT IDENTIFIER,
   *   parameters     ANY DEFINED BY algorithm OPTIONAL
   * }
   * ```
   */

```

## MinIO extension to Bucket Versioning

### Idempotent versions on directory objects