Scripts for building python3.7 .debs for Debian systems that may not have them available. Also known as a "backport." This recipe is a lightly-modified version of someone else's very nice work with python3.6.
Because f-strings are nice. ...Oh, and Debian took python3.6 out of the pool for some reason.
From source. Just run the build script. It's not that hard. You can do it.