> Büyük, kirli bir evi temizlemelisin.

*Evet, tüm hikaye bu*.

---

Beklemek yok 🕙. Hiçbir yerde.  Sadece evin birden fazla yerinde yapılacak fazlasıyla iş var.

You could have turns as in the burgers example, first the living room, then the kitchen, but as you are not waiting 🕙 for anything, just cleaning and cleaning, the turns wouldn't affect anything.

This kind of asynchronicity is what made NodeJS popular (even though NodeJS is not parallel) and that's the strength of Go as a programming language.

And that's the same level of performance you get with **FastAPI**.

    return results
```

---

Se sua aplicação (de alguma forma) não tem que se comunicar com nada mais e tem que esperar que o respondam, use `async def`.

---

Se você simplesmente não sabe, use apenas `def`.

---

    results = some_library()
    return results
```

---

Si votre application n'a pas à communiquer avec une bibliothèque externe et pas à attendre de réponse, utilisez `async def`.

---

Si vous ne savez pas, utilisez seulement `def` comme vous le feriez habituellement.

---

**Note** : vous pouvez mélanger `def` et `async def` dans vos *fonctions de chemin* autant que nécessaire, **FastAPI** saura faire ce qu'il faut avec.

```Python hl_lines="2"
# This is not asynchronous
def get_sequential_burgers(number: int):
    # Do some sequential stuff to create the burgers
    return burgers
```

Con `async def`, Python sabe que, dentro de esa función, debe tener en cuenta las expresiones `wait` y que puede "pausar" ⏸ la ejecución de esa función e ir a hacer otra cosa 🔀 antes de regresar.