You could also use it to generate code automatically, for clients that communicate with your API. For example, frontend, mobile or IoT applications.

## Recap, step by step

### Step 1: import `FastAPI`

{* ../../docs_src/first_steps/tutorial001.py hl[1] *}

`FastAPI` is a Python class that provides all the functionality for your API.

But if you need to access variables and objects from the same **FastAPI** app, or you need to perform small background tasks (like sending an email notification), you can simply just use `BackgroundTasks`.

## Recap

        "tax": 3.2
    }
}
```

instead of:

```JSON
{
    "name": "Foo",
    "description": "The pretender",
    "price": 42.0,
    "tax": 3.2
}
```

## Recap

You can add multiple body parameters to your *path operation function*, even though a request can only have a single body.

```

////

//// tab | Python 3.8+

```Python hl_lines="35"
{!> ../../docs_src/body_updates/tutorial002.py!}
```

////

### Partial updates recap

In summary, to apply partial updates you would:

* (Optionally) use `PATCH` instead of `PUT`.
* Retrieve the stored data.
* Put that data in a Pydantic model.

{!> ../../docs_src/extra_models/tutorial005_py39.py!}
```

////

//// tab | Python 3.8+

```Python hl_lines="1  8"
{!> ../../docs_src/extra_models/tutorial005.py!}
```

////

## Recap

Use multiple Pydantic models and inherit freely for each case.

/// tip

Prefer to use the `Annotated` version if possible.

///

```Python hl_lines="11"
{!> ../../docs_src/path_params_numeric_validations/tutorial006.py!}
```

////

## Recap

With `Query`, `Path` (and others you haven't seen yet) you can declare metadata and string validations in the same ways as with [Query Parameters and String Validations](query-params-str-validations.md){.internal-link target=_blank}.

/// tip

Prefer to use the `Annotated` version if possible.

///

```Python hl_lines="11  18"
{!> ../../docs_src/request_files/tutorial003.py!}
```

////

## Recap

/// tip

Prefer to use the `Annotated` version if possible.

///

```Python hl_lines="30-32"
{!> ../../docs_src/security/tutorial002.py!}
```

////

## Recap

You can now get the current user directly in your *path operation function*.

We are already halfway there.

We just need to add a *path operation* for the user/client to actually send the `username` and `password`.

You can try it already in the interactive docs:

<img src="/img/tutorial/security/image03.png">

We are not verifying the validity of the token yet, but that's a start already.

## Recap

I'll show you how to **build your own image from scratch** to run a single Uvicorn process. It is a simple process and is probably what you would want to do when using a distributed container management system like **Kubernetes**.

## Recap

You can use multiple worker processes with the `--workers` CLI option with the `fastapi` or `uvicorn` commands to take advantage of **multi-core CPUs**, to run **multiple processes in parallel**.