pkgos-alternative-bin(8) on Linux
The text a2d0c50944c1, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch) shipped it. The page shows this text now.
add alternative(s) simlink ( see update-alternatives(8) ) of the python (version 2 and 3) target package in the debian/{post{inst,rm},prerm} files and suggest additions to debian/rules.