Bunu büyük olasılıkla ilk kurulumda, sadece bir kez yaparsınız.

/// tip | İpucu

Bu Domain Adı kısmı HTTPS’ten çok daha önce gelir. Ancak her şey domain ve IP adresine bağlı olduğu için burada bahsetmeye değer.

///

### DNS { #dns }

Şimdi gerçek HTTPS parçalarına odaklanalım.

Önce tarayıcı, bu örnekte `someapp.example.com` olan domain için **IP**’nin ne olduğunu **DNS server**’larına sorar.

from fastapi import FastAPI, Query

app = FastAPI()


@app.get("/items/")
async def read_items(q: str | None = Query(default=None, min_length=3, max_length=50)):
    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
    if q:
        results.update({"q": q})

Linux-like paths MSYS uses, for example, Docker.
"""

import argparse
import os


def should_convert(var_name: str,
                   blacklist: list[str] | None,
                   whitelist_prefix: list[str] | None):
  """Check the variable name against white/black lists."""
  if blacklist and var_name in blacklist:
    return False
  if not whitelist_prefix:
    return True

oat-right {\n  float: right !important;\n}\n\n.float-none {\n  float: none !important;\n}\n\n@media (min-width: 576px) {\n  .float-sm-left {\n    float: left !important;\n  }\n  .float-sm-right {\n    float: right !important;\n  }\n  .float-sm-none {\n    float: none !important;\n  }\n}\n\n@media (min-width: 768px) {\n  .float-md-left {\n    float: left !important;\n  }\n  .float-md-right {\n    float: right !important;\n  }\n  .float-md-none {\n    float: none !important;\n  }\n}\n\n@media (min-width:...

informa ao SQLModel que o `id` é a **chave primária** no banco de dados SQL (você pode aprender mais sobre chaves primárias SQL na documentação do SQLModel).

    **Nota:** Usamos `int | None` para o campo de chave primária para que, no código Python, possamos *criar um objeto sem um `id`* (`id=None`), assumindo que o banco de dados irá *gerá-lo ao salvar*. O SQLModel entende que o banco de dados fornecerá o `id` e *define a coluna como um `INTEGER` não nulo* no esquema do banco de dados. Veja...

        isFocusList = false;
      } else if (e.keyCode === KEY_CODES.UP) {
        if ($boxElement.css("display") !== "none") {
          e.preventDefault();
        }
        suggestor.selectlist("up");
      } else if (e.keyCode === KEY_CODES.DOWN) {
        if ($boxElement.css("display") === "none") {
          suggestor.suggest();
        } else {
          suggestor.selectlist("down");
        }

/// note | Hinweis

FastAPI weiß, dass der Wert von `q` nicht erforderlich ist, aufgrund des definierten Defaultwertes `= None`.

Das `str | None` wird von FastAPI nicht verwendet, um zu bestimmen, dass der Wert nicht erforderlich ist. FastAPI weiß, dass er nicht erforderlich ist, weil er einen Defaultwert von `= None` hat.

Und Sie können auch Body-Parameter als optional kennzeichnen, indem Sie den Defaultwert auf `None` setzen:

{* ../../docs_src/body_multiple_params/tutorial001_an_py310.py hl[18:20] *}

/// note | Hinweis

Beachten Sie, dass in diesem Fall das `item`, welches vom Body genommen wird, optional ist. Da es `None` als Defaultwert hat.

///

## Mehrere Body-Parameter { #multiple-body-parameters }

And you can also declare body parameters as optional, by setting the default to `None`:

{* ../../docs_src/body_multiple_params/tutorial001_an_py310.py hl[18:20] *}

/// note

Notice that, in this case, the `item` that would be taken from the body is optional. As it has a `None` default value.

///

## Multiple body parameters { #multiple-body-parameters }

from typing import Annotated

from fastapi import FastAPI
from fastapi.temp_pydantic_v1_params import Body
from pydantic.v1 import BaseModel


class Item(BaseModel):
    name: str
    description: str | None = None
    size: float


app = FastAPI()


@app.post("/items/")
async def create_item(item: Annotated[Item, Body(embed=True)]) -> Item: