It can't handle nested models very well. So, if the JSON body in the request is a JSON object that has inner fields that in turn are nested JSON objects, it cannot be properly documented and validated.

!!! check "Inspired **FastAPI** to"
    Use Python types to have great editor support.

* Allow `callable`s in *path operation functions*, like functions modified with `functools.partial`. PR [#977](https://github.com/tiangolo/fastapi/pull/977).

## 0.48.0

* Run linters first in tests to error out faster. PR [#948](https://github.com/tiangolo/fastapi/pull/948).
* Log warning about `email-validator` only when used. PR [#946](https://github.com/tiangolo/fastapi/pull/946).

=== "Python 3.9+"

    Deklarieren Sie die Variable mit der gleichen Doppelpunkt-Syntax (`:`).

    Als Typ nehmen Sie `list`.

    Da die Liste ein Typ ist, welcher innere Typen enthält, werden diese von eckigen Klammern umfasst:

    ```Python hl_lines="1"
    {!> ../../../docs_src/python_types/tutorial006_py39.py!}
    ```

=== "Python 3.8+"

    *, dependant: Dependant, values: Dict[str, Any], is_coroutine: bool
) -> Any:
    # Only called by get_request_handler. Has been split into its own function to
    # facilitate profiling endpoints, since inner functions are harder to profile.
    assert dependant.call is not None, "dependant.call must be a function"

    if is_coroutine:
        return await dependant.call(**values)
    else: