According to Google App Engine Third Party Libraries Support, the latest version of lxml supported is 2.3 https://cloud.google.com/appengine/docs/python/tools/libraries27
And python-pptx requires lxml >= 3.1.0 https://github.com/scanny/python-pptx/blob/master/requirements.txt
So what's the best way (if possible) to run python-pptx on GAE?
Note: I'm using buildout to deploy my applications, and that where those restrictions fail.
Thanks!
App Engine isn't compatible with that library so your best bet if you still want to stick with App Engine services is to use Managed VMs: https://cloud.google.com/appengine/docs/managed-vms/
This will let you access all the App Engine services but give you more flexibility with installing libraries.