/usr/lib/python2.7/dist-packages/ninja_ide/gui/main_panel/class_diagram.py is in ninja-ide 2.3-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/ninja_ide/gui/main_panel/../../../../../../share/pyshared/ninja_ide/gui/main_panel/class_diagram.py