### Crear una clase `Enum` { #create-an-enum-class }

Importa `Enum` y crea una subclase que herede de `str` y de `Enum`.

Al heredar de `str`, la documentación de la API podrá saber que los valores deben ser de tipo `string` y podrá representarlos correctamente.

Luego crea atributos de clase con valores fijos, que serán los valores válidos disponibles:

    assertEquals("Uno", japaneseToSpanish.apply("Ichi"));
    assertThrows(IllegalArgumentException.class, () -> japaneseToSpanish.apply("Ni"));
    assertEquals("Tres", japaneseToSpanish.apply("San"));
    assertThrows(IllegalArgumentException.class, () -> japaneseToSpanish.apply("Shi"));

    new EqualsTester()

        "/wrapped-class-instance-dependency/",
        "/wrapped-class-instance-async-dependency/",
        "/wrapped-class-instance-gen-dependency/",
        "/wrapped-class-instance-async-gen-dependency/",
        "/class-instance-wrapped-dependency/",
        "/class-instance-wrapped-async-dependency/",
        "/class-instance-async-wrapped-dependency/",
        "/class-instance-async-wrapped-async-dependency/",

            + "loader instead. As a result, you will not be able to garbage collect this class "
            + "loader. To support reclaiming this class loader, either resolve the underlying "
            + "issue, or move Guava to your system class path.";

    @Override
    public @Nullable Class<?> loadFinalizer() {
      /*
       * We use URLClassLoader because it's the only concrete class loader implementation in the

${version} org.apache.maven maven-plugin-api jar 2.0 org/apache/maven/plugin/coreit/AMojo.class package org.apache.maven.plugin.coreit; public synchronized class AMojo extends org.apache.maven.plugin.AbstractMojo { private String version; private String[] models; public void AMojo(); public void execute(); } org/apache/maven/plugin/coreit/BMojo.class package org.apache.maven.plugin.coreit; public synchronized class BMojo extends org.apache.maven.plugin.AbstractMojo { private String version; private String[]...

    }
  }

  @GwtIncompatible("Reflection")
  @J2ktIncompatible
  public void testAllOverloads_checkNotNull() throws Exception {
    for (ImmutableList<Class<?>> sig : allSignatures(Object.class)) {
      Method checkArgumentMethod =
          Preconditions.class.getMethod("checkNotNull", sig.toArray(new Class<?>[] {}));
      checkArgumentMethod.invoke(

          .put(NullPointerException.class, e -> e instanceof NullPointerException)
          .put(NumberFormatException.class, e -> e instanceof NumberFormatException)
          .put(RuntimeException.class, e -> e instanceof RuntimeException)
          .put(TimeoutException.class, e -> e instanceof TimeoutException)

          .put(NullPointerException.class, e -> e instanceof NullPointerException)
          .put(NumberFormatException.class, e -> e instanceof NumberFormatException)
          .put(RuntimeException.class, e -> e instanceof RuntimeException)
          .put(TimeoutException.class, e -> e instanceof TimeoutException)

          .put(NoSuchElementException.class, e -> e instanceof NoSuchElementException)
          .put(NullPointerException.class, e -> e instanceof NullPointerException)
          .put(NumberFormatException.class, e -> e instanceof NumberFormatException)
          .put(RuntimeException.class, e -> e instanceof RuntimeException)
          .put(TimeoutException.class, e -> e instanceof TimeoutException)

from typing import Union

from fastapi import Body, FastAPI
from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    description: Union[str, None] = None
    price: float
    tax: Union[float, None] = None


@app.put("/items/{item_id}")
async def update_item(
    *,
    item_id: int,
    item: Item = Body(
        examples=[
            {
                "name": "Foo",