Zum Beispiel könnten Sie eine Datei `main.py` haben mit:

```Python hl_lines="3"
import os

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

/// tip | Tipp

Das zweite Argument von [`os.getenv()`](https://docs.python.org/3.8/library/os.html#os.getenv) ist der Defaultwert, der zurückgegeben wird.

                atTotal += pool.Available
                if atTotal > choose && pool.Available > 0 {
                        return pool.Index
                }
        }
        // Should not happen, but print values just in case.
        panic(fmt.Errorf("reached end of serverPools (total: %v, atTotal: %v, choose: %v)", total, atTotal, choose))
}
```

## Other usages

### Advanced use cases with multiple ellipses

```

就能以如下方式调用：

```Python
user_dict = user_in.model_dump()
```

现在，变量 `user_dict` 中的是包含数据的 `dict`（它是 `dict`，不是 Pydantic 模型对象）。

以如下方式调用：

```Python
print(user_dict)
```

输出的就是 Python `dict`：

```Python
{
    'username': 'john',
    'password': 'secret',
    'email': '******@****.***',
    'full_name': None,
}
```

// The logic to sort by last octet is implemented to
// prefer CIDRs with higher octets, this in-turn skips the
// localhost/loopback address to be not preferred as the
// first ip on the list. Subsequently this list helps us print
// a user friendly message with appropriate values.
func sortIPs(ipList []string) []string {
	if len(ipList) == 1 {
		return ipList
	}

	var ipV4s []net.IP
	var nonIPs []string

```python
from typing import Any


def some_function(data: Any):
    print(data)
```

### Generic-типы { #generic-types }

Некоторые типы могут принимать «параметры типов» в квадратных скобках, чтобы определить их внутренние типы. Например, «список строк» объявляется как `list[str]`.

Örneğin, [bir dosyayı okumak için `with` kullanabilirsiniz](https://docs.python.org/3/tutorial/inputoutput.html#reading-and-writing-files):

```Python
with open("./somefile.txt") as f:
    contents = f.read()
    print(contents)
```

Temelde `open("./somefile.txt")`, "Context Manager" olarak adlandırılan bir nesne oluşturur.

`with` bloğu bittiğinde, exception olsa bile dosyanın kapatılmasını garanti eder.

                MINIMUM_DOCKER_VERSION,
                availability.version
            );
            throwDockerRequiredException(message);
        }

        // Some other problem, print the error
        final String message = String.format(
            Locale.ROOT,
            "a problem occurred while using Docker from [%s]%s yet it is required to run the following task%s: \n%s\n"

Si vous avez besoin de quelque chose de facile à intégrer avec FastAPI mais plus robuste, pris en charge par Redis, PostgreSQL ou autres, consultez [encode/broadcaster](https://github.com/encode/broadcaster).

///

## Plus d'informations { #more-info }

user_dict = user_in.model_dump()
```

artık `user_dict` değişkeninde modelin verilerini içeren bir `dict` vardır (Pydantic model nesnesi yerine bir `dict` elde etmiş oluruz).

Ve eğer şunu çağırırsak:

```Python
print(user_dict)
```

şöyle bir Python `dict` elde ederiz:

```Python
{
    'username': 'john',
    'password': 'secret',
    'email': '******@****.***',
    'full_name': None,
}
```

## Ihre `fastapi`-Version pinnen { #pin-your-fastapi-version }

Als Erstes sollten Sie die Version von **FastAPI**, die Sie verwenden, an die höchste Version „pinnen“, von der Sie wissen, dass sie für Ihre Anwendung korrekt funktioniert.