[legal-discuss] [kolla]is it OK to modify python code in OpenStack project?

Recently, Kolla project has requirement to modify[1] the python's ConfigParser.py code[0]. Python is using PSF license[3], which is GPL compatible. But OpenStack is using Apache License. Here is the diff view[2]. I want to make sure: is it OK to re-license ConfigParser.py? If not, what the solution? [0] https://github.com/python/cpython/blob/2.7/Lib/ConfigParser.py [1] https://review.openstack.org/412101 [2] https://gist.github.com/jeffrey4l/2258b276cbd038e73797cfa0952da371/revisions... [3] https://docs.python.org/3/license.html -- Regards, Jeffrey Zhang Blog: http://xcodest.me