/usr/share/python/runtime.d/pythoncad.rtupdate is in pythoncad 0.1.37.0-3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 | #! /bin/sh -e
if [ "$1" = rtupdate ]; then
	pyclean /usr/share/pythoncad
	pycompile -V 2.4- /usr/share/pythoncad
fi
 |