Setting micromamba python version

I am trying to make a micromamba environment using the shell script on the wiki.
I cannot figure out how to specify the python version.

If I add python=3.11 to the mamba create line, it fails to fin python. If I add python to the target packages, it still can’t ind the python version.

3.11 is installed on my system.
https://wiki.nixos.org/wiki/Python#Using_micromamba
Any help is appreciated.