/usr/lib/python2.6/dist-packages/pywt/thresholding.py is in python-pywt 0.2.0-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.6/dist-packages/pywt/../../../../share/pyshared/pywt/thresholding.py