import os

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

/// tip | 提示

第二个参数是 [`os.getenv()`](https://docs.python.org/3.8/library/os.html#os.getenv) 的默认返回值。

如果没有提供，默认值为 `None`，这里我们提供 `"World"` 作为默认值。

///

然后你可以调用这个 Python 程序：

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

<div class="termy">

```console
// 这里我们还没有设置环境变量
$ python main.py

// 因为我们没有设置环境变量，所以我们得到的是默认值

			return Config{}, err
		}
	} else {
		cfg.RRS.Parity = defaultRRSParity
		if setDriveCount == 1 {
			cfg.RRS.Parity = 0
		}
	}

	// Validation is done after parsing both the storage classes. This is needed because we need one
	// storage class value to deduce the correct value of the other storage class.
	if err = validateParity(cfg.Standard.Parity, cfg.RRS.Parity, setDriveCount); err != nil {
		return Config{}, err

     */
    String getSource();

    /**
     * Gets the one-based index of the line containing the problem. The line number should refer to some text file that
     * is given by {@link #getSource()}.
     *
     * @return The one-based index of the line containing the problem or a non-positive value if unknown.
     */
    int getLineNumber();

    /**

```Python
from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: str | None = None):
    return {"item_id": item_id, "q": q}
```

### Dockerfile { #dockerfile }

Теперь в той же директории проекта создайте файл `Dockerfile`:

```{ .dockerfile .annotate }
# (1)!

master into your branch. A reviewer might ask you to rebase a
long-running pull request in which case force pushing is okay for that
request. Note that squashing at the end of the review process should
also not be done, that can be done when the pull request is [integrated
via GitHub](https://github.com/blog/2141-squash-your-commits).

Contributing to the Elasticsearch codebase
------------------------------------------

    return doBackward(uncheckedCastNullableTToT(b));
  }

  /**
   * Returns an iterable that applies {@code convert} to each element of {@code fromIterable}. The
   * conversion is done lazily.
   *
   * <p>The returned iterable's iterator supports {@code remove()} if the input iterator does. After
   * a successful {@code remove()} call, {@code fromIterable} no longer contains the corresponding
   * element.

			),
		},
	}
}

// Wrapper for calling Create Bucket and ensure we get one and only one success.
func TestCreateBucket(t *testing.T) {
	ExecObjectLayerAPITest(ExecObjectLayerAPITestArgs{t: t, objAPITest: testCreateBucket, endpoints: []string{"MakeBucket"}})
}

// testCreateBucket - Test for calling Create Bucket and ensure we get one and only one success.

    assert response.status_code == 200
    assert response.json() == {
        "item_id": 5,
        "item": {"name": "Foo", "price": 3.0, "description": None, "tax": None},
    }


def test_items_6(client: TestClient):
    response = client.put(
        "/items/6",
        json={
            "item": {
                "name": "Bar",
                "price": 0.2,

echo "done"

if [ ! -f ./mc ]; then
	echo -n "Downloading MinIO client ..."
	wget -O mc https://dl.min.io/client/mc/release/linux-amd64/mc &&
		chmod +x mc
	echo "done"
fi

export MC_HOST_minio1=https://minio:minio123@localhost:9001
export MC_HOST_minio2=https://minio:minio123@localhost:9002

		// user or a "virtual" user (parent of an STS account).
		//
		// If parent is a regular user => policy mapping is done on that parent itself.
		//
		// If parent is "virtual" => policy mapping is done on the virtual
		// parent and that virtual parent is an stsUser.
		//
		// To load the appropriate mapping, we check the parent user type.