sudo pip install --upgrade six Downloading/unpacking sixfromhttps://pypi.python.org/packages/3.3/s/six/six-1.9.0-py2.py3-none-any.whl#md5=9ac7e129a80f72d6fc1f0216f6e9627b Downloading six-1.9.0-py2.py3-none-any.whl Installing collected packages: six Found existing installation: six1.5.2 Not uninstalling sixat /usr/lib/python2.7/dist-packages, owned by OS Successfully installed six Cleaning up...