/usr/lib/python2.6/dist-packages/Pyste/MultipleCodeUnit.py is in libboost-python1.49-dev 1.49.0-3.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.6/dist-packages/Pyste/../../../../share/pyshared/Pyste/MultipleCodeUnit.py