Zum Beispiel:

```Python
class Cat:
    def __init__(self, name: str):
        self.name = name


fluffy = Cat(name="Mr Fluffy")
```

In diesem Fall ist `fluffy` eine Instanz der Klasse `Cat`.

Und um `fluffy` zu erzeugen, rufen Sie `Cat` auf.

Eine Python-Klasse ist also auch ein **Callable**.

    val unixScript = """
mkdir -p $performanceTestSplitDirectoryName
rm -rf $performanceTestSplitDirectoryName/*-$fileNamePostfix
cat > $performanceTestSplitDirectoryName/$action-$fileNamePostfix << EOL
${csvLines.joinToString("\n")}
EOL

echo "Performance tests to be ${action}d in this build"
cat $performanceTestSplitDirectoryName/$action-$fileNamePostfix
"""

Create new canned policy file `adminManageUser.json`. This policy enables admin user to
manage other users.

```json
cat > adminManageUser.json << EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": [
        "admin:CreateUser",
        "admin:DeleteUser",
        "admin:ConfigUpdate"
      ],

    Form, as described in Section 3.1, and You must inform recipients of
    the Executable Form how they can obtain a copy of such Source Code
    Form by reasonable means in a timely manner, at a charge no more
    than the cost of distribution to the recipient; and

(b) You may distribute such Executable Form under the terms of this
    License, or sublicense it under different terms, provided that the

* Write messages from them.
* Then close one of the tabs.

That will raise the `WebSocketDisconnect` exception, and all the other clients will receive a message like:

```
Client #1596980209979 left the chat
```

!!! tip
    The app above is a minimal and simple example to demonstrate how to handle and broadcast messages to several WebSocket connections.

    ```

尝试以下操作：

* 使用多个浏览器选项卡打开应用程序。
* 从这些选项卡中发送消息。
* 然后关闭其中一个选项卡。

这将引发 `WebSocketDisconnect` 异常，并且所有其他客户端都会收到类似以下的消息：

```
Client #1596980209979 left the chat
```

!!! tip
    上面的应用程序是一个最小和简单的示例，用于演示如何处理和向多个 WebSocket 连接广播消息。

    但请记住，由于所有内容都在内存中以单个列表的形式处理，因此它只能在进程运行时工作，并且只能使用单个进程。

    THE COVERED SOFTWARE IS WITH YOU. SHOULD ANY COVERED SOFTWARE PROVE
    DEFECTIVE IN ANY RESPECT, YOU (NOT THE INITIAL DEVELOPER OR ANY
    OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY SERVICING,
    REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN
    ESSENTIAL PART OF THIS LICENSE. NO USE OF ANY COVERED SOFTWARE IS
    AUTHORIZED HEREUNDER EXCEPT UNDER THIS DISCLAIMER.

pkg syscall (darwin-386), const PROT_NONE ideal-int
pkg syscall (darwin-386), const PROT_READ ideal-int
pkg syscall (darwin-386), const PROT_WRITE ideal-int
pkg syscall (darwin-386), const PTRACE_CONT ideal-int
pkg syscall (darwin-386), const PTRACE_KILL ideal-int
pkg syscall (darwin-386), const PTRACE_TRACEME ideal-int
pkg syscall (darwin-386), const PT_ATTACH ideal-int

pkg syscall (darwin-arm64), const PROT_READ ideal-int
pkg syscall (darwin-arm64), const PROT_WRITE = 2
pkg syscall (darwin-arm64), const PROT_WRITE ideal-int
pkg syscall (darwin-arm64), const PTRACE_CONT = 7
pkg syscall (darwin-arm64), const PTRACE_CONT ideal-int
pkg syscall (darwin-arm64), const PTRACE_KILL = 8
pkg syscall (darwin-arm64), const PTRACE_KILL ideal-int
pkg syscall (darwin-arm64), const PTRACE_TRACEME = 0

pkg syscall (freebsd-arm64), const PROT_READ ideal-int
pkg syscall (freebsd-arm64), const PROT_WRITE = 2
pkg syscall (freebsd-arm64), const PROT_WRITE ideal-int
pkg syscall (freebsd-arm64), const PTRACE_CONT = 7
pkg syscall (freebsd-arm64), const PTRACE_CONT ideal-int
pkg syscall (freebsd-arm64), const PTRACE_KILL = 8
pkg syscall (freebsd-arm64), const PTRACE_KILL ideal-int
pkg syscall (freebsd-arm64), const PTRACE_TRACEME = 0