Unable to import xgboost 0.9
I had the same problem. Tried to fix both "likely" causes to no avail. Strangely, everything was working absolutely fine just a few days ago. I changed the Python version from 3.6.1 to 3.6.7 and it fixed the issue. Unfortunately, I don't yet know what the problem was, but it fixed the issue for me.

This is Python's docker image on CircleCi's linux machine. Specifying this in case the problem has to do anything with it.