now i wish Python had a way to add commands

[Gribouillis]

My xonsh shell uses /usr/bin/python (which is linked to python3) as Python interpreter, in Ubuntu 20.04. So it uses the distribution's Python 3 interpreter. Of course Xonsh contains a specific parser for the xonsh language, which is a mix of python and shell constructs.

~/P/S/2021-12 import sys
~/P/S/2021-12 sys.executable
'/usr/bin/python'
~/P/S/2021-12 echo "Hello xonsh!"
Hello xonsh!