## 建立和使用環境變數

你在 **shell（終端機）**中就可以**建立**和使用環境變數，並不需要用到 Python：

//// tab | Linux, macOS, Windows Bash

<div class="termy">

```console
// 你可以使用以下指令建立一個名為 MY_NAME 的環境變數
$ export MY_NAME="Wade Wilson"

// 然後，你可以在其他程式中使用它，例如
$ echo "Hello $MY_NAME"

Hello Wade Wilson
```

</div>

////

//// tab | Windows PowerShell

<div class="termy">

```console

ECL0099=Field({1}) of class({0}) is not a static field.
ECL0100=Method({1}) of class({0}) is not a static method.
ECL0101=File({0}) is not exist or not readable.
ECL0102=File({0}) is not exist or not writable.
ECL0103=Type({0}) is an interface not a class.
ECL0104=Argument({0}) is not an array.
ECL0105=Rethrew {0} as a runtime exception.
ECL0106=IOException occurred, because {0}

            // Test parent of root - currently throws NPE due to bug in SmbFile.getParent()
            // when authority is null. This is a known issue in the legacy implementation.
            // For now, we expect the NPE to maintain backward compatibility
            assertThrows(NullPointerException.class, () -> new SmbFile("smb1://").getParent());
        }

        @Test

Estes tipos que possuem tipos internos são chamados de tipos "**genéricos**". E é possível declará-los mesmo com os seus tipos internos.

Para declarar esses tipos e os tipos internos, você pode usar o módulo Python padrão `typing`. Ele existe especificamente para suportar esses type hints.

#### Versões mais recentes do Python

A sintaxe utilizando `typing` é **compatível** com todas as versões, desde o Python 3.6 até as últimas, incluindo o Python 3.9, 3.10, etc.

Webhooks estão disponíveis a partir do OpenAPI 3.1.0, e possui suporte do FastAPI a partir da versão `0.99.0`.

///

## Uma aplicação com webhooks

Quando você cria uma aplicação com o **FastAPI**, existe um atributo chamado `webhooks`, que você utilizar para defini-los da mesma maneira que você definiria as suas **operações de rotas**, utilizando por exemplo `@app.webhooks.post()`.

    id: actual-behavior
    attributes:
      label: "What did you see happen?"
    validations:
      required: true
  - type: textarea
    id: expected-behavior
    attributes:
      label: "What did you expect to see?"
    validations:
      required: true
  - type: textarea
    id: editor-and-settings
    attributes:
      label: "Editor and settings"

# ==============================================================================
#
# Sets up custom apt sources for our TF images.

# Prevent apt install tzinfo from asking our location (assumes UTC)
export DEBIAN_FRONTEND=noninteractive

# Set up shared custom sources
apt-get update
apt-get install -y gnupg ca-certificates

# Deadsnakes: https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa

         * In theory, cancel() could execute arbitrary listeners -- bad to do while holding a lock.
         * However, we don't expose currentFuture to users, so they can't attach listeners. And the
         * Future might not even be a ListenableFuture, just a plain Future. That said, similar
         * problems can exist with methods like FutureTask.done(), not to mention slow calls to

}

// BucketRemoteDestinationNotFound bucket does not exist.
type BucketRemoteDestinationNotFound GenericError

func (e BucketRemoteDestinationNotFound) Error() string {
	return "Destination bucket does not exist: " + e.Bucket
}

// BucketRemoteTargetNotFound remote target does not exist.
type BucketRemoteTargetNotFound GenericError

func (e BucketRemoteTargetNotFound) Error() string {

 */
package okhttp3.internal.http

import java.net.Proxy
import okhttp3.HttpUrl
import okhttp3.Request

object RequestLine {
  /**
   * Returns the request status line, like "GET / HTTP/1.1". This is exposed to the application by
   * [HttpURLConnection.getHeaderFields], so it needs to be set even if the transport is
   * HTTP/2.
   */
  fun get(
    request: Request,
    proxyType: Proxy.Type,
  ): String =