* 📝 Fix example code with sets in Tutorial - Body - Nested Models 3. PR [#2054](https://github.com/tiangolo/fastapi/pull/2054) by [@hitrust](https://github.com/hitrust).
* 📝 Fix example code with sets in Tutorial - Body - Nested Models 2. PR [#2053](https://github.com/tiangolo/fastapi/pull/2053) by [@hitrust](https://github.com/hitrust).

    ```

## Set types

But then we think about it, and realize that tags shouldn't repeat, they would probably be unique strings.

And Python has a special data type for sets of unique items, the `set`.

Then we can declare `tags` as a set of strings:

=== "Python 3.10+"

    ```Python hl_lines="12"
    {!> ../../../docs_src/body_nested_models/tutorial003_py310.py!}
    ```

```Python
some_var.get()
```

### Set context variables in the `async` dependency `reset_db_state()`

If some part of the async code sets the value with `some_var.set("updated in function")` (e.g. like the `async` dependency), the rest of the code in it and the code that goes after (including code inside of `async` functions called with `await`) will see that new value.

Observa que la variable `item` es unos de los elementos en la lista `items`.

El editor aún sabe que es un `str` y provee soporte para ello.

#### Tuples y Sets

Harías lo mismo para declarar `tuple`s y `set`s:

```Python hl_lines="1  4"
{!../../../docs_src/python_types/tutorial007.py!}
```

Esto significa: