from datetime import date

from pydantic import BaseModel

# Déclare une variable comme étant une str
# et profitez de l'aide de votre IDE dans cette fonction
def main(user_id: str):
    return user_id


# Un modèle Pydantic
class User(BaseModel):
    id: int
    name: str
    joined: date
```
Qui peuvent ensuite être utilisés comme cela:

```Python
my_user: User = User(id=3, name="John Doe", joined="2018-07-19")

# Return a Response Directly { #return-a-response-directly }

When you create a **FastAPI** *path operation* you can normally return any data from it: a `dict`, a `list`, a Pydantic model, a database model, etc.

By default, **FastAPI** would automatically convert that return value to JSON using the `jsonable_encoder` explained in [JSON Compatible Encoder](../tutorial/encoder.md){.internal-link target=_blank}.

# Module okhttp-tls

{
  "formatVersion": "1.1",
  "component": {
    "group": "${pom.groupId}",
    "module": "${pom.artifactId}",
    "version": "${pom.version}",
    "attributes": {
      "org.gradle.status": "${module.status}"
    }
  },
  "createdBy": {
    "maven": {
      "version": "${maven.version}",
      "buildId": "${maven.build.version}"
    }
  },
  "variants": [
    {
      "name": "${variant.jvmEnvironmentVariantName}ApiElements",

![ReDoc](https://fastapi.tiangolo.com/img/index/index-06-redoc-02.png)

### Just Modern Python { #just-modern-python }

It's all based on standard **Python type** declarations (thanks to Pydantic). No new syntax to learn. Just standard modern Python.

Import `BaseSettings` from Pydantic and create a sub-class, very much like with a Pydantic model.

The same way as with Pydantic models, you declare class attributes with type annotations, and possibly default values.

You can use all the same validation features and tools you use for Pydantic models, like different data types and additional validations with `Field()`.

//// tab | Pydantic v2

## Filtrar Datos - Seguridad

Para asegurarte de que no devuelves más datos de los que deberías, lee la documentación para [Tutorial - Modelo de Response - Tipo de Retorno](../tutorial/response-model.md){.internal-link target=_blank}.

## Etiquetas de Documentación - OpenAPI

Sebastián Ramírez <******@****.***> 1731896744 +0100

timothy <******@****.***> 1748612313 +0900

Sebastián Ramírez <******@****.***> 1731896744 +0100