Ask HN: Will there be an easy/safe way to replace Python 2 with Python 3?

With Python 2's End of Life scheduled for 2020, I'm curious to know whether there will be a recommended way to remove Python 2.x from my systems? With my Onion Omega 2P I can simply uninstall 2 and install 3. On my Linux boxes I'm not so sure. Anyone got any definitive go-to's that I can consult?