## Parámetros opcionales { #optional-parameters }

De la misma manera, puedes declarar parámetros de query opcionales, estableciendo su valor por defecto en `None`:

{* ../../docs_src/query_params/tutorial002_py310.py hl[7] *}

En este caso, el parámetro de función `q` será opcional y será `None` por defecto.

/// check | Revisa

rue)` сообщает SQLModel, что `id` — это **первичный ключ** в SQL базе данных (подробнее о первичных ключах SQL можно узнать в документации SQLModel).

    **Примечание:** Мы используем `int | None` для поля первичного ключа, чтобы в Python-коде можно было *создать объект без `id`* (`id=None`), предполагая, что база данных *сгенерирует его при сохранении*. SQLModel понимает, что база данных предоставит `id`, и *определяет столбец как `INTEGER` (не `NULL`)* в схеме базы данных. См. <a href...

import subprocess

from playwright.sync_api import Playwright, sync_playwright


# Run playwright codegen to generate the code below, copy paste the sections in run()
def run(playwright: Playwright) -> None:
    browser = playwright.chromium.launch(headless=False)
    # Update the viewport manually
    context = browser.new_context(viewport={"width": 960, "height": 1080})
    page = context.new_page()
    page.goto("http://localhost:8000/docs")

version: "2"
linters:
  default: none
  enable:
    - durationcheck
    - forcetypeassert
    - gocritic
    - gomodguard
    - govet
    - ineffassign
    - misspell
    - revive
    - staticcheck
    - unconvert
    - unused
    - usetesting
    - whitespace
  settings:
    misspell:
      locale: US
    staticcheck:
      checks:
        - all
        - -SA1008
        - -SA1019
        - -SA4000

		{xForwardedFor, "", ""},                                                       // None
		{xRealIP, "8.8.8.8", "8.8.8.8"},                                               // Single address
		{xRealIP, "[2001:db8:cafe::17]:4711", "[2001:db8:cafe::17]"},                  // IPv6 address
		{xRealIP, "", ""},                                                             // None
		{forwarded, `for="_gazonk"`, "_gazonk"},                                       // Hostname

import subprocess

from playwright.sync_api import Playwright, sync_playwright


# Run playwright codegen to generate the code below, copy paste the sections in run()
def run(playwright: Playwright) -> None:
    browser = playwright.chromium.launch(headless=False)
    # Update the viewport manually
    context = browser.new_context(viewport={"width": 960, "height": 1080})
    page = context.new_page()
    page.goto("http://localhost:8000/docs")

        c.cookies.set("session_id", "123")
        response = c.get("/items/")
    assert response.status_code == 200
    assert response.json() == {
        "session_id": "123",
        "fatebook_tracker": None,
        "googall_tracker": None,
    }


def test_cookie_param_model_invalid(client: TestClient):
    response = client.get("/items/")
    assert response.status_code == 422
    assert response.json() == {
        "detail": [

     * @return the classifier or an empty string if none, never {@code null}
     * @see ArtifactCoordinates#getClassifier()
     */
    @Nonnull
    String getClassifier();

    /**
     * Returns the file extension of the artifact.
     * The dot separator is not included in the returned string.
     *
     * @return the file extension or an empty string if none, never {@code null}

    if not (config.site_url or "").endswith(f"{lang}/") and lang != "en":
        config.site_url = f"{config.site_url}{lang}/"
    return config


def resolve_file(*, item: str, files: Files, config: MkDocsConfig) -> None:
    item_path = Path(config.docs_dir) / item
    if not item_path.is_file():
        en_src_dir = (Path(config.docs_dir) / "../../en/docs").resolve()
        potential_path = en_src_dir / item

import subprocess
import time

import httpx
from playwright.sync_api import Playwright, sync_playwright


# Run playwright codegen to generate the code below, copy paste the sections in run()
def run(playwright: Playwright) -> None:
    browser = playwright.chromium.launch(headless=False)
    # Update the viewport manually
    context = browser.new_context(viewport={"width": 960, "height": 1080})
    page = context.new_page()