* **Geen compromisen** met databases, gebruikersinterfaces, enz. Maar eenvoudige integratie met ze allemaal.

### Ongelimiteerde "plug-ins"

Of anders gezegd, je hebt ze niet nodig, importeer en gebruik de code die je nodig hebt.

///

## Validation additionnelle

Nous allons imposer que bien que `q` soit un paramètre optionnel, dès qu'il est fourni, **sa longueur n'excède pas 50 caractères**.

## Importer `Query`

Pour cela, importez d'abord `Query` depuis `fastapi` :

{* ../../docs_src/query_params_str_validations/tutorial002.py hl[3] *}

## Utiliser `Query` comme valeur par défaut

```

### Re-use os manipulares de exceção do **FastAPI**

Se você quer usar a exceção em conjunto com o mesmo manipulador de exceção *default* do **FastAPI**, você pode importar e re-usar esses manipuladores de exceção do `fastapi.exception_handlers`:

```Python hl_lines="2-5  15  21"
{!../../docs_src/handling_errors/tutorial006.py!}
```

import json
import logging
import os
import re
import shutil
import subprocess
from functools import lru_cache
from http.server import HTTPServer, SimpleHTTPRequestHandler
from importlib import metadata
from multiprocessing import Pool
from pathlib import Path
from typing import Any, Dict, List, Optional, Union

import mkdocs.utils
import typer
import yaml
from jinja2 import Template
from ruff.__main__ import find_ruff_bin

///

Aqui definimos a configuração `env_file` dentro da classe `Settings` do Pydantic, e definimos o valor como o nome do arquivo dotenv que queremos utilizar.

<div class="termy">

```console
$ cd ~/code/prisoner-of-azkaban

$ python main.py

// Erro ao importar o Sirius, ele não está instalado 😱
Traceback (most recent call last):
    File "main.py", line 1, in <module>
        import sirius
```

</div>

pkg go/ast, func IsGenerated(*File) bool #28089
pkg go/ast, func NewPackage //deprecated #52463
pkg go/ast, type File struct, GoVersion string #59033
pkg go/ast, type Importer //deprecated #52463
pkg go/ast, type Object //deprecated #52463
pkg go/ast, type Package //deprecated #52463
pkg go/ast, type Scope //deprecated #52463
pkg go/build/constraint, func GoVersion(Expr) string #59033

pkg go/build, func Import(string, string, ImportMode) (*Package, error)
pkg go/build, func ImportDir(string, ImportMode) (*Package, error)
pkg go/build, func IsLocalImport(string) bool
pkg go/build, method (*Context) Import(string, string, ImportMode) (*Package, error)
pkg go/build, method (*Context) ImportDir(string, ImportMode) (*Package, error)
pkg go/build, method (*Context) SrcDirs() []string

pkg encoding/json, type UnmarshalFieldError //deprecated
pkg go/build, const AllowBinary //deprecated
pkg go/doc, type Package struct, Bugs //deprecated
pkg go/importer, func For //deprecated
pkg go/importer, func ForCompiler //deprecated
pkg go/types, func NewInterface //deprecated
pkg go/types, method (*Interface) Embedded //deprecated
pkg image, var ZP //deprecated
pkg image, var ZR //deprecated