python not detected on computer

[snippsat]

You try to run py -v in python script,it's a command line tool.
Do this open cmd and type this,and it's large py -V or py --version

py -V
python -V
python3 -V
where py
where python
where python3
pip -V
pip3 -V

Report back the output of this,do not mess with VS Code yet.