De esta manera puedes añadir anotaciones de tipos correctas a tus funciones incluso cuando estás devolviendo un tipo diferente al modelo de response, para ser utilizado por el editor y herramientas como mypy. Y aún así puedes hacer que FastAPI realice la validación de datos, documentación, etc. usando el `response_model`.

normal para una pequeña ganancia de rendimiento (alrededor de 100 nanosegundos), ten en cuenta que en **FastAPI** el efecto sería bastante opuesto. En estos casos, es mejor usar `async def` a menos que tus *path operation functions* usen código que realice <abbr title="Input/Output - Entrada/Salida: lectura o escritura en disco, comunicaciones de red.">I/O</abbr> de bloqueo.

Aun así, en ambas situaciones, es probable que **FastAPI** [siga siendo más rápida](index.md#performance) que (o al...

func (b *Buffer) ReadBytes(delim byte) (line []byte, err error) {
	slice, err := b.readSlice(delim)
	// return a copy of slice. The buffer's backing array may
	// be overwritten by later calls.
	line = append(line, slice...)
	return line, err
}

// readSlice is like ReadBytes but returns a reference to internal buffer data.
func (b *Buffer) readSlice(delim byte) (line []byte, err error) {
	i := IndexByte(b.buf[b.off:], delim)

// of the line. The returned buffer is only valid until the next call to
// ReadLine. ReadLine either returns a non-nil line or it returns an error,
// never both.
//
// The text returned from ReadLine does not include the line end ("\r\n" or "\n").
// No indication or error is given if the input ends without a final line end.
// Calling [Reader.UnreadByte] after ReadLine will always unread the last byte read

Ceci est un **tutoriel rapide / rappel** à propos des annotations de type Python. Il couvre uniquement le minimum nécessaire pour les utiliser avec **FastAPI** ... ce qui est en réalité très peu.

**FastAPI** est totalement basé sur ces annotations de type, elles lui donnent de nombreux avantages et bénéfices.

    val reader = BufferedReader(InputStreamReader(connection.inputStream, UTF_8))
    assertThat(connection.responseCode).isEqualTo(HttpURLConnection.HTTP_OK)
    assertThat(reader.readLine()).isEqualTo("hello world")
    val request = server.takeRequest()
    assertThat(request.requestLine).isEqualTo("GET / HTTP/1.1")
    assertThat(request.headers["Accept-Language"]).isEqualTo("en-US")

    val reader = BufferedReader(InputStreamReader(inputStream, StandardCharsets.UTF_8))
    assertThat(connection.getResponseCode()).isEqualTo(HttpURLConnection.HTTP_OK)
    assertThat(reader.readLine()).isEqualTo("hello world")
    val request = server.takeRequest()
    assertThat(request.requestLine).isEqualTo("GET / HTTP/1.1")
    assertThat(request.getHeader("Accept-Language")).isEqualTo("en-US")

            String line = br.readLine();
            while (line != null) {
                lineNumber++;
                gatherDeadUserGuideLinksInLineReleaseNotes(sourceFile, line, lineNumber, errorsForFile);
                gatherDeadJavadocLinksInLineReleaseNotes(sourceFile, line, lineNumber, errorsForFile);

                line = br.readLine();
            }
        } catch (IOException e) {

                String currentID = "";

                try (BufferedReader reader = new BufferedReader(new FileReader(cpuInfoFile))) {
                    for (String line = reader.readLine(); line != null; line = reader.readLine()) {
                        if (line.contains(":")) {
                            List<String> parts = Arrays.stream(line.split(":", 2)).map(String::trim).collect(Collectors.toList());

        ByteStreams.newDataInput(
            "This is a line\r\nThis too\rand this\nand also this".getBytes(UTF_8));
    assertThat(in.readLine()).isEqualTo("This is a line");
    assertThat(in.readLine()).isEqualTo("This too");
    assertThat(in.readLine()).isEqualTo("and this");
    assertThat(in.readLine()).isEqualTo("and also this");
  }

  public void testNewDataInput_readFloat() {