For example, we, the team behind FastAPI, built <a href="https://fastapicloud.com" class="external-link" target="_blank">**FastAPI Cloud**</a>, to make deploying FastAPI apps to the cloud as streamlined as possible, with the same developer experience of working with FastAPI.

Por ejemplo, nosotros, el equipo detrás de FastAPI, construimos <a href="https://fastapicloud.com" class="external-link" target="_blank">**FastAPI Cloud**</a>, para hacer que desplegar aplicaciones de FastAPI en la nube sea lo más ágil posible, con la misma experiencia de desarrollador de trabajar con FastAPI.

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    description: str | None = None
    price: float
    tax: float = 10.5


items = {
    "foo": {"name": "Foo", "price": 50.2},
    "bar": {"name": "Bar", "description": "The Bar fighters", "price": 62, "tax": 20.2},
    "baz": {
        "name": "Baz",
        "description": "There goes my baz",

### Filtragem de dados FastAPI { #fastapi-data-filtering }

Agora, para FastAPI, ele verá o tipo de retorno e garantirá que o que você retornar inclua **apenas** os campos que são declarados no tipo.

from fastapi import FastAPI
from fastapi.testclient import TestClient
from inline_snapshot import snapshot

app = FastAPI(
    servers=[
        {"url": "/", "description": "Default, relative server"},
        {
            "url": "http://staging.localhost.tiangolo.com:8000",
            "description": "Staging but actually localhost still",
        },
        {"url": "https://prod.example.com"},
    ]
)


@app.get("/foo")

from typing import Optional

import pytest
from fastapi import FastAPI
from fastapi.exceptions import ResponseValidationError
from fastapi.testclient import TestClient
from pydantic.dataclasses import dataclass

app = FastAPI()


@dataclass
class Item:
    name: str
    price: Optional[float] = None
    owner_ids: Optional[list[int]] = None


@app.get("/items/invalid", response_model=Item)
def get_invalid():

# Fonctionnalités

## Fonctionnalités de FastAPI

**FastAPI** vous offre ceci:

### Basé sur des standards ouverts

///

## Das Haupt-`FastAPI` { #the-main-fastapi }

Sehen wir uns nun das Modul unter `app/main.py` an.

Hier importieren und verwenden Sie die Klasse `FastAPI`.

Dies ist die Hauptdatei Ihrer Anwendung, die alles zusammenfügt.

А также в его документации будут содержаться оба ответа: один для `404` и другой для `403`.

///

## Модуль main в `FastAPI` { #the-main-fastapi }

Теперь давайте посмотрим на модуль `app/main.py`.

Именно сюда вы импортируете и именно здесь вы используете класс `FastAPI`.

Это основной файл вашего приложения, который объединяет всё в одно целое.

from typing import Annotated

from fastapi import FastAPI, Header, HTTPException
from pydantic import BaseModel

fake_secret_token = "coneofsilence"

fake_db = {
    "foo": {"id": "foo", "title": "Foo", "description": "There goes my hero"},
    "bar": {"id": "bar", "title": "Bar", "description": "The bartenders"},
}

app = FastAPI()


class Item(BaseModel):
    id: str
    title: str
    description: str | None = None