/usr/src/WrapITK/Python/WrapITK.pth.in is in libinsighttoolkit3-dev 3.20.1+git20120521-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # Python pth file to add WrapITK's path to sys.path.
@CONFIG_WRAP_ITK_PYTHON_DIR@
|