/usr/lib/python2.7/dist-packages/Crypto/Util/py21compat.py is in python-crypto 2.4.1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/Crypto/Util/../../../../../share/pyshared/Crypto/Util/py21compat.py