You can use Koder as your editor to write python code. Just be sure to save your files with the .py extension.
To run your python files, you need to use iSH. You can find instructions on how to install iSH here Once you have iSH installed, you can install Python.
First install python like so:
apk add python3
To check what version o python is installed you can use the command:
python3 --version
The version number should be >= 3.9
Then you can open a python interpreter at any point with the command python3.
You can also run your python scripts like so:
cd /path/to/wherever/you/stored/your/goodies
python3 my_script.py
Try it out and remember to ask for help if you get stuck.