/usr/lib/python3/dist-packages/oauthlib/oauth2/rfc6749/grant_types/ is in python3-oauthlib 2.0.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python3/dist-packages/oauthlib/oauth2/rfc6749/grant_types/__init__.py
/usr/lib/python3/dist-packages/oauthlib/oauth2/rfc6749/grant_types/authorization_code.py
/usr/lib/python3/dist-packages/oauthlib/oauth2/rfc6749/grant_types/base.py
/usr/lib/python3/dist-packages/oauthlib/oauth2/rfc6749/grant_types/client_credentials.py
/usr/lib/python3/dist-packages/oauthlib/oauth2/rfc6749/grant_types/implicit.py
/usr/lib/python3/dist-packages/oauthlib/oauth2/rfc6749/grant_types/openid_connect.py
/usr/lib/python3/dist-packages/oauthlib/oauth2/rfc6749/grant_types/refresh_token.py
/usr/lib/python3/dist-packages/oauthlib/oauth2/rfc6749/grant_types/resource_owner_password_credentials.py