[SOLVED] Openstack python api: How create a connection using Application Credentials?

Openstack python api: How create a connection using Application Credentials?

Currently I am using (of course with more elaborate variables):

conn = openstack.connect(
                load_yaml_config=False,
                load_envvars=False,
                auth_url=AL,
                project_name=PN,
                username=UN,
                password=PW,
                region_name=RN,
                user_domain_name=UDN,
                project_domain_name=PDN,
                app_name=42,
                app_version=42
            )

to connect to projects. But in the future I would like to offer using application credentials, too. While there is plenty of documentation on how to authenticate with said credentials, I can't find anything about authenticating a connection with it. How is it done?

So what I am looking for is a way to create a connection without username and password, but credentials instead.

On connection: https://docs.openstack.org/openstacksdk/latest/user/connection.html
On application credentials: https://docs.openstack.org/keystone/queens/user/application_credentials.html
On rest-api calls https://docs.openstack.org/api-ref/identity/v3/index.html#application-credentials

Existing authenticated session

This might be an option:

From existing authenticated Session
-----------------------------------

For applications that already have an authenticated Session, simply passing
it to the :class:`~openstack.connection.Connection` constructor is all that
is needed:

.. code-block:: python

    from openstack import connection

    conn = connection.Connection(
        session=session,
        region_name='example-region',
        compute_api_version='2',
        identity_interface='internal')

but I have to investigate further.

Solution

I couldn't find any documentation, but apparently it is possible to create a connection like this:

    openstack.connect(
        load_yaml_config=False,
        load_envvars=False,
        auth_url=AU,
        region_name=RN,
        application_credential_id=ACI,
        application_credential_secret=ACS,
        auth_type=AT
    )

and that will return a connection object just like before. auth_type has to be "v3applicationcredential" when using application credentials.