While the world seems to have moved away from #Python2, I am still actively developing packages published on #PyPI, including some #Python3 #stubs packages.
The main challenges I've faced have been some of my "build" dependencies like #black, #pyflakes and #mypy dropping support for Python 2.
Always worrying about the future the next challenge we will face will be #github deprecating #ubuntu 20.04; as of now only 18.04 and 20.04 are the ones including Python 2.7, with 18.04 already deprecated.