/usr/lib/python2.7/dist-packages/melange/ipv4/db_based_ip_generator/generator.py is in python-melange 1:2012.1-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/melange/ipv4/db_based_ip_generator/../../../../../../share/pyshared/melange/ipv4/db_based_ip_generator/generator.py