</div>

////

## 在 Python 中讀取環境變數

你也可以在 Python **之外**的終端機中建立環境變數（或使用其他方法），然後在 Python 中**讀取**它們。

例如，你可以建立一個名為 `main.py` 的檔案，其中包含以下內容：

```Python hl_lines="3"
import os

name = os.getenv("MY_NAME", "World")
print(f"Hello {name} from Python")
```

/// tip

第二個參數是 <a href="https://docs.python.org/zh-tw/3.8/library/os.html#os.getenv" class="external-link" target="_blank">`os.getenv()`</a> 的預設回傳值。

		"avx512enc/avx512_bitalg",
		"avx512enc/avx512_ifma",
		"avx512enc/avx512_vbmi",
		"avx512enc/avx512_vbmi2",
		"avx512enc/avx512_vnni",
		"avx512enc/avx512_vpopcntdq",
	}
	for _, name := range filenames {
		testEndToEnd(t, "amd64", name)
	}
}

func TestAMD64Errors(t *testing.T) {
	testErrors(t, "amd64", "amd64error")
}

func TestAMD64DynLinkErrors(t *testing.T) {

    /**
     * Set to true if you want to output the current thread name. Defaults to true.
     *
     * @since 4.0.0
     */
    @Config(type = "java.lang.Boolean", defaultValue = "true")
    public static final String MAVEN_LOGGER_SHOW_THREAD_NAME = MAVEN_LOGGER_PREFIX + "showThreadName";

    /**
     * Set to true if you want the Logger instance name to be included in output messages. Defaults to true.
     *

ase();if(t.length<this.options.minLength)return n.default(ft).empty(),this._addNotFound(),void this.close();var a=ct.filter((function(e){return e.name.toLowerCase().includes(t)})),i=n.default(a.slice(0,this.options.maxResults));n.default(ft).empty(),0===i.length?this._addNotFound():i.each((function(t,a){n.default(ft).append(e._renderItem(escape(a.name),encodeURI(a.link),a.path))})),this.open()},a.open=function(){n.default(ot).parent().addClass(et),n.default(rt).removeClass(tt).addClass(at)},a.cl...

		zb0001--
		field, err = dc.ReadMapKeyPtr()
		if err != nil {
			err = msgp.WrapError(err)
			return
		}
		switch msgp.UnsafeString(field) {
		case "Name":
			z.Name, err = dc.ReadString()
			if err != nil {
				err = msgp.WrapError(err, "Name")
				return
			}
		case "NextCycle":
			z.NextCycle, err = dc.ReadUint32()
			if err != nil {
				err = msgp.WrapError(err, "NextCycle")
				return
			}

name: Feature Enhancement Request
description: I want to make an existing feature better
labels: ["type=enhancement"]
body:
  - type: markdown
    attributes:
      value: >
        Filing feature requests is one of the most popular ways to contribute to Guava.


        Be aware, though: most feature requests are not accepted, even if they're suggested by
        a full-time Guava team member. [Feedback](https://stackoverflow.com/a/4543114) from our

Marcin Erdmann <******@****.***> <******@****.***>
Marco Vermeulen <******@****.***> <******@****.***>
Mark Vieira <******@****.***> <******@****.***>
Michael Barnathan <******@****.***> <michael@barnathan.name>
Paul King <******@****.***> <******@****.***>
Paul Merlin <******@****.***> <******@****.***>
Peter Niederwieser <******@****.***> <pniederw@.(none)>

 */
public class AdminDuplicatehostAction extends FessAdminAction {

    /**
     * Default constructor.
     */
    public AdminDuplicatehostAction() {
        super();
    }

    /**
     * Role name for duplicate host administration.
     */
    public static final String ROLE = "admin-duplicatehost";

    private static final Logger logger = LogManager.getLogger(AdminDuplicatehostAction.class);

* `Optional`
* ...и др.

называются **Generic-типами** или **Generics**.

### Классы как типы

Вы также можете объявить класс как тип переменной.

Допустим, у вас есть класс `Person` с полем `name`:

{* ../../docs_src/python_types/tutorial010.py hl[1:3] *}


Тогда вы можете объявить переменную типа `Person`:

{* ../../docs_src/python_types/tutorial010.py hl[6] *}

Output decrypted to inspect.ad2b43d8.zip
```