* `float`
* `bool`
* `bytes`

```Python hl_lines="1"
{!../../../docs_src/python_types/tutorial005.py!}
```

### Tipos genéricos com parâmetros de tipo

Existem algumas estruturas de dados que podem conter outros valores, como `dict`, `list`, `set` e `tuple`. E os valores internos também podem ter seu próprio tipo.

Para declarar esses tipos e os tipos internos, você pode usar o módulo Python padrão `typing`.

Python will complain if you put a value with a "default" before a value that doesn't have a "default".

But you can re-order them, and have the value without a default (the query parameter `q`) first.

It doesn't matter for **FastAPI**. It will detect the parameters by their names, types and default declarations (`Query`, `Path`, etc), it doesn't care about the order.

So, you can declare your function as:

=== "Python 3.8 non-Annotated"

And we know that editors can't provide a lot of support (like completion) for `dict`s, because they can't know their keys and value types.

We can do better...

## What makes a dependency

Up to now you have seen dependencies declared as functions.

But that's not the only way to declare dependencies (although it would probably be the more common).

!!! warning
    There's a high chance that you **don't** need this base image or any other similar one, and would be better off by building the image from scratch as [described above in: Build a Docker Image for FastAPI](#build-a-docker-image-for-fastapi).

But that will only allow certain types of communication, excluding everything that involves credentials: Cookies, Authorization headers like those used with Bearer Tokens, etc.

So, for everything to work correctly, it's better to specify explicitly the allowed origins.

## Use `CORSMiddleware`

You can configure it in your **FastAPI** application using the `CORSMiddleware`.

* Import `CORSMiddleware`.

!!! note
    FastAPI will know that the value of `q` is not required because of the default value `= None`.

    The `Union` in `Union[str, None]` is not used by FastAPI, but will allow your editor to give you better support and detect errors.

## Without Pydantic

  ```
  다른 일반적인 대화에서만 채팅을 사용하십시오.
  ```

  기존 [지터 채팅](https://gitter.im/tiangolo/fastapi) 이 있지만 채널과 고급기능이 없어서 대화를 하기가 조금 어렵기 때문에 지금은 디스코드가 권장되는 시스템입니다.

  ### 질문을 위해 채팅을 사용하지 마십시오

  채팅은 더 많은 "자유로운 대화"를 허용하기 때문에, 너무 일반적인 질문이나 대답하기 어려운 질문을 쉽게 질문을 할 수 있으므로, 답변을 받지 못할 수 있습니다.

You could use these tools and ideas if you are setting up **your own deployment system** while taking care of the other deployment concepts yourself.