And will also be used in the API docs inside each *path operation* that needs them:

<img src="/img/tutorial/body/image02.png">

## Editor support

In your editor, inside your function you will get type hints and completion everywhere (this wouldn't happen if you received a `dict` instead of a Pydantic model):

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

You also get error checks for incorrect type operations:

If your database is stolen, the thief won't have your users' plaintext passwords, only the hashes.

So, the thief won't be able to try to use that password in another system (as many users use the same password everywhere, this would be dangerous).

## Install `passlib`

PassLib is a great Python package to handle password hashes.

It supports many secure hashing algorithms and utilities to work with them.

* **Fewer bugs**: Reduce about 40% of human (developer) induced errors. *
* **Intuitive**: Great editor support. <abbr title="also known as auto-complete, autocompletion, IntelliSense">Completion</abbr> everywhere. Less time debugging.
* **Easy**: Designed to be easy to use and learn. Less time reading docs.
* **Short**: Minimize code duplication. Multiple features from each parameter declaration. Fewer bugs.

        //
        // Parsing errors can happen during the processing of the arguments and we prefer not having to check if
        // the logger is null and construct this so we can use an SLF4J logger everywhere.
        //
        slf4jLogger = new Slf4jStdoutLogger();

        cliManager = new CLIManager();

        CommandLine mavenConfig = null;
        try {

    * Add `default_response_class` parameter to `APIRouter`.
    * Original PR [#722](https://github.com/tiangolo/fastapi/pull/722) by [@booooh](https://github.com/booooh).
* Refactor logging to use the same logger everywhere, update log strings and levels. PR [#781](https://github.com/tiangolo/fastapi/pull/781).