If you get a: IOError: [Errno 13] Permission denied

[Christer Sjöholm]

Answer copied from https://stackoverflow.com/questions/27870024/google-gmail-api-installed-app-shows-ioerror-13-from-module-ssl-py-w-o-sudo

The httplib2 installer sets incorrect permissions for its httplib2/cacerts.txt file. One solution is to simply make its files readable by anyone by running

chmod o+r -R /usr/local/lib/python2.7/dist-packages/httplib2-0.9-py2.7.egg

However, it may be better to uninstall the version installed by pip, and use your operating system's package manager instead, which probably has the correct permissions for all files. On Debian, this could be accomplished with

pip uninstall httplib2 apt-get install python-httplib2

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Christer Sjöholm