It was one of the first extremely fast Python frameworks based on `asyncio`. It was made to be very similar to Flask.

/// note | Technical Details

It used <a href="https://github.com/MagicStack/uvloop" class="external-link" target="_blank">`uvloop`</a> instead of the default Python `asyncio` loop. That's what made it so fast.

    "Topic :: Software Development :: Libraries",
    "Topic :: Software Development",
    "Typing :: Typed",
    "Development Status :: 4 - Beta",
    "Environment :: Web Environment",
    "Framework :: AsyncIO",
    "Framework :: FastAPI",
    "Framework :: Pydantic",
    "Framework :: Pydantic :: 2",
    "Intended Audience :: Developers",
    "Programming Language :: Python :: 3 :: Only",

        "/async-wrapped-dependency-async-wrapper/",
        "/async-wrapped-gen-dependency-async-wrapper/",
        "/wrapped-class-instance-dependency-async-wrapper/",
        "/wrapped-class-instance-async-dependency-async-wrapper/",
        "/wrapped-class-dependency-async-wrapper/",
        "/wrapped-endpoint-async-wrapper/",
        "/async-wrapped-endpoint-async-wrapper/",
    ],
)

### Otras formas de código asíncrono { #other-forms-of-asynchronous-code }

Este estilo de usar `async` y `await` es relativamente nuevo en el lenguaje.

/// tip | Dica

Adicionando o `standard`, o Uvicorn instalará e usará algumas dependências extras recomendadas.

Isso inclui o `uvloop`, a substituição de alto desempenho para `asyncio`, que fornece um grande aumento de desempenho de concorrência.

Quando você instala o FastAPI com algo como `pip install "fastapi[standard]"`, você já obtém `uvicorn[standard]` também.

///

### Other forms of asynchronous code { #other-forms-of-asynchronous-code }

This style of using `async` and `await` is relatively new in the language.

from fastapi.types import DependencyCacheKey
from typing_extensions import Literal

if sys.version_info >= (3, 13):  # pragma: no cover
    from inspect import iscoroutinefunction
else:  # pragma: no cover
    from asyncio import iscoroutinefunction


def _unwrapped_call(call: Optional[Callable[..., Any]]) -> Any:
    if call is None:
        return call  # pragma: no cover
    unwrapped = inspect.unwrap(_impartial(call))

C'était l'un des premiers frameworks Python extrêmement rapides basés sur `asyncio`. Il a été conçu pour être très similaire à Flask.

/// note | Détails techniques

Il utilisait <a href="https://github.com/MagicStack/uvloop" class="external-link" target="_blank">`uvloop`</a> au lieu du système par défaut de Python `asyncio`. C'est ce qui l'a rendu si rapide.

Це був один із перших надзвичайно швидких фреймворків Python на основі `asyncio`. Він був дуже схожий на Flask.

/// note | Технічні деталі

Він використовував <a href="https://github.com/MagicStack/uvloop" class="external-link" target="_blank">`uvloop`</a> замість стандартного циклу Python `asyncio`. Ось що зробило його таким швидким.

Gleichzeitig müssen aber mit `async def` definierte Funktionen „erwartet“ („awaited“) werden. Daher können Funktionen mit `async def` nur innerhalb von Funktionen aufgerufen werden, die auch mit `async def` definiert sind.

Daraus resultiert das Ei-und-Huhn-Problem: Wie ruft man die erste `async` Funktion auf?