OPCODE_CONTROL_CLOSE -> {
        var code = CLOSE_NO_STATUS_CODE
        var reason = ""
        val bufferSize = controlFrameBuffer.size
        if (bufferSize == 1L) {
          throw ProtocolException("Malformed close payload length of 1.")
        } else if (bufferSize != 0L) {
          code = controlFrameBuffer.readShort().toInt()
          reason = controlFrameBuffer.readUtf8()

    // You could create an env var MY_NAME with
    $ export MY_NAME="Wade Wilson"

    // Then you could use it with other programs, like
    $ echo "Hello $MY_NAME"

    Hello Wade Wilson
    ```

    </div>

=== "🚪 📋"

    <div class="termy">

    ```console
    // Create an env var MY_NAME
    $ $Env:MY_NAME = "Wade Wilson"

    // Use it with other programs, like
    $ echo "Hello $Env:MY_NAME"

  optional k8s.io.apimachinery.pkg.apis.meta.v1.Time lastTransitionTime = 3;

  // `reason` is a unique, one-word, CamelCase reason for the condition's last transition.
  optional string reason = 4;

  // `message` is a human-readable message indicating details about last transition.
  optional string message = 5;
}

  optional k8s.io.apimachinery.pkg.apis.meta.v1.Time lastTransitionTime = 3;

  // `reason` is a unique, one-word, CamelCase reason for the condition's last transition.
  optional string reason = 4;

  // `message` is a human-readable message indicating details about last transition.
  optional string message = 5;
}

<img src="/img/python-types/image06.png">

Notice that this means "`one_person` is an **instance** of the class `Person`".

It doesn't mean "`one_person` is the **class** called `Person`".

## Pydantic models

<a href="https://docs.pydantic.dev/" class="external-link" target="_blank">Pydantic</a> is a Python library to perform data validation.

You declare the "shape" of the data as classes with attributes.

  // Last time the condition transitioned from one status to another.
  optional k8s.io.apimachinery.pkg.apis.meta.v1.Time lastTransitionTime = 7;

  // The reason for the condition's last transition.
  optional string reason = 4;

  // A human readable message indicating details about the transition.
  optional string message = 5;
}

// DeploymentList is a list of Deployments.

  // one status to another
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.Time lastTransitionTime = 3;

  // reason is the reason for the condition's last transition.
  // +optional
  optional string reason = 4;

  // message is a human-readable explanation containing details about
  // the transition
  // +optional
  optional string message = 5;
}

  // one status to another
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.Time lastTransitionTime = 3;

  // reason is the reason for the condition's last transition.
  // +optional
  optional string reason = 4;

  // message is a human-readable explanation containing details about
  // the transition
  // +optional
  optional string message = 5;
}

  internal val writeTimeout = StreamTimeout()

  /**
   * The reason why this stream was closed, or null if it closed normally or has not yet been
   * closed.
   *
   * If there are multiple reasons to abnormally close this stream (such as both peers closing it
   * near-simultaneously) then this is the first reason known to this peer.
   */
  internal var errorCode: ErrorCode? = null

  // If unset, the message is "failed Expression: {Expression}".
  // +optional
  optional string message = 2;

  // Reason represents a machine-readable description of why this validation failed.
  // If this is the first validation in the list to fail, this reason, as well as the
  // corresponding HTTP response code, are used in the
  // HTTP response to the client.