I just fixed my own instance of this problem.
I had two versions of python; the default, 2.6 (which you determine with which python
), and 2.7. pip put six under 2.7, but my app ran 2.6, which had only the tar file.
The repair that worked for me:
cd /usr/lib/python2.6/site-packages
sudo cp -rp ../../python2.7/site-packages/six* .
My app works as expected now.
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