I am getting
IOError: [Errno 13] Permission denied: \'/usr/local/lib/python2.7/dist-packages/python_dateutil-2.2-py2.7.egg/EGG-INFO/top_level.txt\'
In my case:
sudo chmod o+r /usr/local/lib/python2.7/dist-packages/python_dateutil-2.2-py2.7.egg/EGG-INFO/top_level.txt
In general:
sudo chmod o+r [XXX]
where XXX is the file it is pointing to.