python3-gnupg is gnupg1

The required python bindings provided by python3-gnupg are at least in the latest Ubuntu LTS (16.04) still GNUPG1.

https://packages.ubuntu.com/xenial/python3-gnupg https://packages.ubuntu.com/artful/python3-gnupg

Is this really desired?

Seems to be gnupg2 in bionic:

https://packages.ubuntu.com/bionic/python3-gnupg

The same situation is present on Debian stable (stretch) before backports:

https://packages.debian.org/stretch/python3-gnupg

Also, can you please add a requirements.txt to the base path to describe all dependencies? :)