Uninstalling python from windows where no uninstaller can be found

1. Find out the exact version installed for the package you want to remove. In this case 3.12:

PS > py --list
 -V:3.13 *        Python 3.13 (64-bit)
 -V:3.12          Python 3.12 (64-bit)
PS > py -3.12 --version
Python 3.12.0

2. Find out where the executable is for that version, in this case it is in C:\Program Files\Python312\python.exe:

PS > py -3.12 -c "import sys; print(sys.executable)"
C:\Program Files\Python312\python.exe

3. Delete the root folder containing the executable to remove that python version:

PS > Remove-Item -Path "C:\Program Files\Python312" -Recurse -Force

4. Remove registry entries for that installation (you should find 3.12 as an entry in our case in one or the two places below):

Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\

and/or

Computer\HKEY_CURRENT_USER\SOFTWARE\Python\PythonCore\

5. Confirm the only version installed is the one you expect. In our case we expect only 3.13:

PS > py --list
 -V:3.13 *        Python 3.13 (64-bit)