MaxPyDarkTheme is a dark theme for the Python (PyMXS) scripting editor in 3ds Max. It ships as version 1.0 and uses a slightly different colour scheme than DarkScintilla, keeping the two easy to tell apart when you switch languages: MaxScript shows in black and Python in blue.
Installation runs through the editor rather than a drag-and-drop. Close all 3ds Max sessions, start a new one as administrator, then use Scripting > Run Script and open the DarkPyTheme .mzp file. Admin rights are needed because python.properties only lives inside maxroot. During installation the script makes a backup named python_backup.properties.
If something goes wrong, you can restore the original by deleting python.properties and renaming python_backup.properties back to python.properties. The script is tested on 3ds Max 2023, with 2022.3 and up recommended. Colours can be adjusted to your own preference, and the developer's page includes a guide for that. If you also want a matching dark theme for MaxScript, DarkScintilla is the companion option.