* @param options The options to use for serialization, may be {@code null} to use the default values.
     * @param settings The settings to serialize, must not be {@code null}.
     * @throws IOException If the settings could not be serialized.
     */
    void write(File output, Map<String, Object> options, Settings settings) throws IOException;

    /**

def test_orjson_response_emits_deprecation_warning():
    with pytest.warns(FastAPIDeprecationWarning, match="ORJSONResponse is deprecated"):
        ORJSONResponse(content={"hello": "world"})


# UJSON


def _make_ujson_app() -> FastAPI:
    with warnings.catch_warnings():
        warnings.simplefilter("ignore", FastAPIDeprecationWarning)

Si vous l'exécutez et allez à [http://localhost:8000/v1/](http://localhost:8000/v1/) vous verrez la réponse de Flask :

```txt
Hello, World from Flask!
```

Et si vous allez à [http://localhost:8000/v2](http://localhost:8000/v2) vous verrez la réponse de FastAPI :

```JSON
{
    "message": "Hello World"
}

		t.Fatalf("Unable to create a file \"as-directory/as-file\", %s", err)
	}
	if err = xlStorage.AppendFile(t.Context(), "exists", "as-file", []byte("Hello, World")); err != nil {
		t.Fatalf("Unable to create a file \"as-file\", %s", err)
	}
	if err = xlStorage.AppendFile(t.Context(), "exists", "as-file-parent", []byte("Hello, World")); err != nil {

Якщо ви запустите це й перейдете на [http://localhost:8000/v1/](http://localhost:8000/v1/), ви побачите відповідь від Flask:

```txt
Hello, World from Flask!
```

А якщо ви перейдете на [http://localhost:8000/v2](http://localhost:8000/v2), ви побачите відповідь від FastAPI:

```JSON
{
    "message": "Hello World"
}

```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.

Wenn er nicht angegeben wird, ist er standardmäßig `None`. Hier geben wir „World“ als den zu verwendenden Defaultwert an.

///

import (
	"bufio"
	"bytes"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func ExampleWriter() {
	w := bufio.NewWriter(os.Stdout)
	fmt.Fprint(w, "Hello, ")
	fmt.Fprint(w, "world!")
	w.Flush() // Don't forget to flush!
	// Output: Hello, world!
}

func ExampleWriter_AvailableBuffer() {
	w := bufio.NewWriter(os.Stdout)
	for _, i := range []int64{1, 2, 3, 4} {
		b := w.AvailableBuffer()
		b = strconv.AppendInt(b, i, 10)

def do_blocking_work(name: str) -> str:
    # Some blocking I/O operation
    return f"Hello {name}"


@app.get("/items/")
async def read_items():
    result = await asyncify(do_blocking_work)(name="World")
    return {"message": result}
```

And run async code inside of blocking sync code with `syncify()`:

```python
from asyncer import syncify
from fastapi import FastAPI

app = FastAPI()

Si lo ejecutas y vas a [http://localhost:8000/v1/](http://localhost:8000/v1/) verás el response de Flask:

```txt
Hello, World from Flask!
```

Y si vas a [http://localhost:8000/v2](http://localhost:8000/v2) verás el response de FastAPI:

```JSON
{
    "message": "Hello World"
}

	if err = disk.AppendFile(t.Context(), testCase.volName, pathJoin("hello-world.txt", xlStorageFormatFile), []byte("Hello World")); err != nil {
		t.Fatalf("Create a file `test` failed with %s expected to pass.", err)
	}

	// CheckFile - stat the file.
	if _, err := disk.StatInfoFile(t.Context(), testCase.volName, "hello-world.txt/"+xlStorageFormatFile, false); err != nil {
		t.Fatalf("Stat failed with %s expected to pass.", err)