/// check | Revisa

Así, con la misma declaración de tipo de Python, **FastAPI** te da validación de datos.

Observa que el error también muestra claramente el punto exacto en el que no pasó la validación.

Esto es increíblemente útil cuando estás desarrollando y debugging código que interactúa con tu API.

///

## Documentación

M3M,KAAKorB,aACfze,EAAEob,2BAGH/nB,KAAK8nB,oBAKP7kB,GAAOsB,KAAM,CACZ8mB,QAAQ,EACRC,SAAS,EACTC,YAAY,EACZC,gBAAgB,EAChBC,SAAS,EACTC,QAAQ,EACRC,YAAY,EACZC,SAAS,EACTC,OAAO,EACPC,OAAO,EACPC,UAAU,EACVC,MAAM,EACNC,QAAQ,EACRjqB,MAAM,EACNkqB,UAAU,EACV7d,KAAK,EACL8d,SAAS,EACT1X,QAAQ,EACR2X,SAAS,EACTC,SAAS,EACTC,SAAS,EACTC,SAAS,EACTC,SAAS,EACTC,WAAW,EACXC,aAAa,EACbC,SAAS,EACTC,SAAS,EACTC,eAAe,EACfC,WAAW,EACXC,SAAS,EACTC,OAAO,GACL/pB,GAAOskB,MAAM2C,SAEhBjnB,GAAOsB,KAAM,CAAEoP,MAAO,UAAWsZ,KAAM,YAAc,SAAUtrB,E...

                """
                `username` string. The OAuth2 spec requires the exact field name
                `username`.
                """
            ),
        ],
        password: Annotated[
            str,
            Form(),
            Doc(
                """
                `password` string. The OAuth2 spec requires the exact field name
                `password".
                """
            ),

                                - required:
                                  - exact
                                - required:
                                  - prefix
                                - required:
                                  - regex
                            - required:
                              - exact
                            - required:
                              - prefix

AU,qGACVC,SAAU,KAEdQ,aAAc,CACVC,OAAQ,8BACRC,KAAM,8BACNnI,EAAG,0DACHoI,GAAI,oCACJpT,EAAG,qBACHqT,GAAI,8BACJC,EAAG,qBACHC,GAAI,SAAUtO,GACV,OAAe,IAAXA,EACO,uCAEJA,EAAS,6BAEpB8K,EAAG,qBACHyD,GAAI,SAAUvO,GACV,OAAe,IAAXA,EACO,uCAEJA,EAAS,6BAEpB0O,EAAG,2BACHC,GAAI,SAAU3O,GACV,OAAe,IAAXA,EACO,6CAEJA,EAAS,yCAEpB2I,EAAG,qBACHiG,GAAI,SAAU5O,GACV,OAAe,IAAXA,EACO,uCACAA,EAAS,IAAO,GAAgB,KAAXA,EACrBA,EAAS,sBAEbA,EAAS,8BAGxB6O,cAAe,qTACfnC,KAAM,SAAU9T,GACZ,MAAO,6HAA8BqJ,KAAKrJ,IAE9CkD,SAAU,SAAU+Z,EAAMkB,EAAQ+P,...

```

////

This specific regular expression pattern checks that the received parameter value:

* `^`: starts with the following characters, doesn't have characters before.
* `fixedquery`: has the exact value `fixedquery`.
* `$`: ends there, doesn't have any more characters after `fixedquery`.

#### Password hashing

"Hashing" means: converting some content (a password in this case) into a sequence of bytes (just a string) that looks like gibberish.

Whenever you pass exactly the same content (exactly the same password) you get exactly the same gibberish.

But you cannot convert from the gibberish back to the password.

##### Why use password hashing

  for _name in ["purelib", "platlib"]:
    _site_packages_dirs += [_sysconfig.get_path(_name, _scheme)]

_site_packages_dirs = list(set(_site_packages_dirs))

# Find the location of this exact file.
_current_file_location = _inspect.getfile(_inspect.currentframe())

def _running_from_pip_package():
  return any(
      _current_file_location.startswith(dir_) for dir_ in _site_packages_dirs)

/// check | "Verifique"



///

	Então, com a mesma declaração de tipo do Python, o **FastAPI** dá pra você validação de dados.

	Observe que o erro também mostra claramente o ponto exato onde a validação não passou.

	Isso é incrivelmente útil enquanto se desenvolve e debuga o código que interage com a sua API.

## Documentação

# Separate OpenAPI Schemas for Input and Output or Not

When using **Pydantic v2**, the generated OpenAPI is a bit more exact and **correct** than before. 😎

In fact, in some cases, it will even have **two JSON Schemas** in OpenAPI for the same Pydantic model, for input and output, depending on if they have **default values**.

Let's see how that works and how to change it if you need to do that.

## Pydantic Models for Input and Output