If you can use the **latest versions of Python**, use the examples for the latest version, those will have the **best and simplest syntax**, for example, "**Python 3.10+**".

#### List

For example, let's define a variable to be a `list` of `str`.

=== "Python 3.9+"

    Declare the variable, with the same colon (`:`) syntax.

    As the type, put `list`.

**FastAPI** will know that it can use this dependency to define a "security scheme" in the OpenAPI schema (and the automatic API docs).

!!! info "Technical Details"

## Import Couchbase components

For now, don't pay attention to the rest, only the imports:

```Python hl_lines="3-5"
{!../../../docs_src/nosql_databases/tutorial001.py!}
```

## Define a constant to use as a "document type"

We will use it later as a fixed field `type` in our documents.

This is not required by Couchbase, but is a good practice that will help you afterwards.

```Python hl_lines="9"

Só um detalhe técnico para nerds curiosos. 🤓

Por baixo, na especificação técnica ASGI, essa é a parte do <a href="https://asgi.readthedocs.io/en/latest/specs/lifespan.html" class="external-link" target="_blank">Protocolo Lifespan</a>, e define eventos chamados `startup` e `shutdown`.

!!! info "Informação"

It will perform the validation of the compound data, and will document it like that for the OpenAPI schema and automatic docs.

## Singular values in body

The same way there is a `Query` and `Path` to define extra data for query and path parameters, **FastAPI** provides an equivalent `Body`.

{!../../../docs_src/query_params_str_validations/tutorial003.py!}
```

## Adicionando expressões regulares

Você pode definir uma <abbr title="Uma expressão regular, regex ou regexp é uma sequência de caracteres que define um parâmetro de busca para textos.">expressão regular</abbr> que combine com um padrão esperado pelo parâmetro:

```Python hl_lines="11"
{!../../../docs_src/query_params_str_validations/tutorial004.py!}
```

* **Cloud services** that handle this for you
    * The cloud service will probably **handle replication for you**. It would possibly let you define **a process to run**, or a **container image** to use, in any case, it would most probably be **a single Uvicorn process**, and the cloud service would be in charge of replicating it.

!!! tip

Puis c'est enfin votre tour, vous commandez 2 magnifiques burgers 🍔 pour vous et votre crush 😍.

Vous payez 💸.

Le serveur va dans la cuisine 👨‍🍳.

Vous attendez devant le comptoir afin que personne ne prenne vos burgers 🍔 avant vous, vu qu'il n'y a pas de numéro de commande.

                ],
            ),
        ):
            return item

    # TODO: enable these tests once/if Form(embed=False) is supported
    # TODO: In that case, define if File() should support example/examples too
    # @app.post("/form_example")
    # def form_example(firstname: str = Form(example="John")):
    #     return firstname

    # @app.post("/form_examples")

## 🛠️

↩️ 👥 ⚙️ 🇸🇲 🔗 &amp; 👥 🚫 🚚 🙆 😇 🔌-⚫️ 👷 ⏮️ **FastAPI**, 👥 💪 🛠️ 💽 <abbr title="Automatically updating the database to have any new column we define in our models.">🛠️</abbr> ⏮️ <a href="https://alembic.sqlalchemy.org" class="external-link" target="_blank">⚗</a> 🔗.

&amp; 📟 🔗 🇸🇲 &amp; 🇸🇲 🏷 🖖 🎏 🔬 📁, 👆 🔜 💪 🎭 🛠️ ⏮️ ⚗ 🍵 ✔️ ❎ FastAPI, Pydantic, ⚖️ 🕳 🙆.