And then we do the same for the module `users`.

We could also import them like:

```Python
from app.routers import items, users
```

/// info

The first version is a "relative import":

```Python
from .routers import items, users
```

The second version is an "absolute import":

```Python
from app.routers import items, users
```

```

/// info | Información

La primera versión es un "import relativo":

```Python
from .routers import items, users
```

La segunda versión es un "import absoluto":

```Python
from app.routers import items, users
```

Desde FastAPI 0.119.0, también hay compatibilidad parcial para Pydantic v1 desde dentro de Pydantic v2, para facilitar la migración a v2.

Así que podrías actualizar Pydantic a la última versión 2 y cambiar los imports para usar el submódulo `pydantic.v1`, y en muchos casos simplemente funcionaría.

{* ../../docs_src/pydantic_v1_in_v2/tutorial002_an_py310.py hl[2,5,15] *}

/// warning | Advertencia

import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.function.Supplier;
import java.util.jar.JarFile;
import java.util.stream.Collectors;
import java.util.zip.ZipEntry;

import org.apache.maven.RepositoryUtils;
import org.apache.maven.api.Dependency;
import org.apache.maven.api.Node;
import org.apache.maven.api.PathScope;

Since FastAPI 0.119.0, there's also partial support for Pydantic v1 from inside of Pydantic v2, to facilitate the migration to v2.

So, you could upgrade Pydantic to the latest version 2, and change the imports to use the `pydantic.v1` submodule, and in many cases it would just work.

{* ../../docs_src/pydantic_v1_in_v2/tutorial002_an_py310.py hl[2,5,15] *}

/// warning

<div class="termy">

```console
$ python myapp.py
```

</div>

but is not called when another file imports it, like in:

```Python
from myapp import app
```

#### More details { #more-details }

Let's say your file is named `myapp.py`.

If you run it with:

<div class="termy">

```console
$ python myapp.py
```

</div>

``` hl_lines="5"
.
├── app
│   ├── __init__.py
│   ├── main.py
│   └── test_main.py
```

Because this file is in the same package, you can use relative imports to import the object `app` from the `main` module (`main.py`):

{* ../../docs_src/app_testing/app_a_py39/test_main.py hl[3] *}


...and have the code for the tests just like before.

"docs_src/dependencies/tutorial008b_an_py39.py" = ["B904"]


[tool.ruff.lint.isort]
known-third-party = ["fastapi", "pydantic", "starlette"]

[tool.ruff.lint.pyupgrade]
# Preserve types, even if a file imports `from __future__ import annotations`.
keep-runtime-typing = true

[tool.inline-snapshot]
# default-flags=["fix"]

Wir könnten sie auch wie folgt importieren:

```Python
from app.routers import items, users
```

/// info | Info

Die erste Version ist ein „relativer Import“:

```Python
from .routers import items, users
```

Die zweite Version ist ein „absoluter Import“:

```Python
from app.routers import items, users
```

Agora, vamos ver o módulo em `app/main.py`.

Aqui é onde você importa e usa a classe `FastAPI`.

Este será o arquivo principal em seu aplicativo que une tudo.

E como a maior parte de sua lógica agora viverá em seu próprio módulo específico, o arquivo principal será bem simples.

### Importe o `FastAPI` { #import-fastapi }

Você importa e cria uma classe `FastAPI` normalmente.