```Python
from datetime import date

from pydantic import BaseModel

# Declareer een variabele als een str
# en krijg editorondersteuning in de functie
def main(user_id: str):
    return user_id


# Een Pydantic model
class User(BaseModel):
    id: int
    name: str
    joined: date
```

Vervolgens kan je het op deze manier gebruiken:

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

				} else {
					logger.Default.Warn(context.Background(), "In model %v, the hook function `%v(*gorm.DB) error` has an incorrect parameter type. The expected parameter type is `%v`, but the provided type is `%v`.", schema, cbName, expectedPkgPath, inVarPkg)
					// PASS
				}
			default:

  <mime-type type="model/vnd.flatland.3dml"/>
  <mime-type type="model/vnd.gdl">
    <glob pattern="*.gdl"/>
  </mime-type>
  <mime-type type="model/vnd.gs-gdl"/>
  <mime-type type="model/vnd.gs.gdl"/>
  <mime-type type="model/vnd.gtw">
    <glob pattern="*.gtw"/>
  </mime-type>
  <mime-type type="model/vnd.moml+xml"/>
  <mime-type type="model/vnd.mts">
    <glob pattern="*.mts"/>
  </mime-type>

Anda tidak perlu belajar sintaksis, metode, *classs* baru dari *library* tertentu, dll.

Cukup **Python** standar.

Sebagai contoh untuk `int`:

```Python
item_id: int
```

atau untuk model lebih rumit `Item`:

```Python
item: Item
```

...dengan sekali deklarasi anda mendapatkan:

* Dukungan editor, termasuk:
    * Pelengkapan kode.
    * Pengecekan tipe.
* Validasi data:

      placeholder: ex. go version go1.20.7 darwin/arm64
    validations:
      required: true

  - type: textarea
    id: go-env
    attributes:
      label: "Output of `go env` in your module/workspace:"
      placeholder: |
        GO111MODULE=""
        GOARCH="arm64"
        GOBIN="/Users/gopher/go/bin"
        GOCACHE="/Users/gopher/go/cache"
        GOENV="/Users/gopher/Library/Application Support/go/env"

 *  @author Victor Jonsson, http://victorjonsson.se
 *  @license MIT
 */

pkg image, type RGBA64Image interface, RGBA64At(int, int) color.RGBA64
pkg image/draw, type RGBA64Image interface { At, Bounds, ColorModel, RGBA64At, Set, SetRGBA64 }
pkg image/draw, type RGBA64Image interface, At(int, int) color.Color
pkg image/draw, type RGBA64Image interface, Bounds() image.Rectangle
pkg image/draw, type RGBA64Image interface, ColorModel() color.Model

            return null;
        }
    }

    /**
     * Implementation of {@link ModelSource} that extends {@link PathSource} with model-specific
     * functionality. This implementation uses request-scoped caching ({@link CacheRetention#REQUEST_SCOPED})
     * since it represents a POM file that is actively being built and may change during the build process.

## [Calls](https://square.github.io/okhttp/4.x/okhttp/okhttp3/-call/)

But if you have a bunch of dataclasses laying around, this is a nice trick to use them to power a web API using FastAPI. 🤓

///

## Dataclasses in `response_model` { #dataclasses-in-response-model }

You can also use `dataclasses` in the `response_model` parameter:

{* ../../docs_src/dataclasses/tutorial002.py hl[1,7:13,19] *}

The dataclass will be automatically converted to a Pydantic dataclass.