const std::set<std::string> kPythonPath = {
    "/usr/local/lib/python2.7/dist-packages/",
    "/usr/local/lib/python2.7/site-packages/",
    "/usr/lib/python2.7/dist-packages/",
    "/usr/lib/python2.7/site-packages/",
    "/Library/Python/2.7/site-packages/",
};