Howdy,
I'd like to add stubs for PynamoDB to https://github.com/python/typeshed, a repository used to store PEP 484 type signatures for the python stdlib and popular third party libraries. As per PEP 484, permission is required from the library owner before merging type signatures into typeshed - https://www.python.org/dev/peps/pep-0484/#the-typeshed-repo
Thanks, let me know if you have any questions