Por causa disso, versões do FastAPI anteriores à 0.99.0 ainda usavam versões do OpenAPI inferiores à 3.1.0.

///

### `examples` no Pydantic e no FastAPI { #pydantic-and-fastapi-examples }

Debido a eso, las versiones de FastAPI anteriores a 0.99.0 todavía usaban versiones de OpenAPI menores a 3.1.0.

///

### `examples` de Pydantic y FastAPI { #pydantic-and-fastapi-examples }

from fastapi import FastAPI

app = FastAPI(docs_url="/documentation", redoc_url=None)


@app.get("/items/")
async def read_items():

from fastapi import FastAPI

app = FastAPI()


@app.post("/index-weights/")
async def create_index_weights(weights: dict[int, float]):

from fastapi import FastAPI

app = FastAPI(openapi_url="/api/v1/openapi.json")


@app.get("/items/")
async def read_items():

from fastapi import FastAPI, status

app = FastAPI()


@app.post("/items/", status_code=status.HTTP_201_CREATED)
async def create_item(name: str):

/// tip | Подсказка

Существует официальный генератор проектов на **FastAPI** и **PostgreSQL**, включающий frontend и другие инструменты: <a href="https://github.com/fastapi/full-stack-fastapi-template" class="external-link" target="_blank">https://github.com/fastapi/full-stack-fastapi-template</a>

///

keystone:
  - url: https://fastapicloud.com
    title: FastAPI Cloud. By the same team behind FastAPI. You code. We Cloud.
    img: https://fastapi.tiangolo.com/img/sponsors/fastapicloud.png
gold:
  - url: https://blockbee.io?ref=fastapi
    title: BlockBee Cryptocurrency Payment Gateway
    img: https://fastapi.tiangolo.com/img/sponsors/blockbee.png
  - url: https://github.com/scalar/scalar/?utm_source=fastapi&utm_medium=website&utm_campaign=main-badge

from fastapi import FastAPI

app = FastAPI()


@app.get("/keyword-weights/", response_model=dict[str, float])
async def read_keyword_weights():

from typing import Optional, Union

from fastapi import FastAPI
from fastapi.testclient import TestClient
from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: Optional[str] = None


class OtherItem(BaseModel):
    price: int


@app.post("/items/")
def save_union_body(item: Union[OtherItem, Item]):
    return {"item": item}


client = TestClient(app)