Upgrade Python

Steps

1. Open a bash console
2. Remove Django: rm -rf virtualenvs/django2/ (or 1.9 depending on the version that you have)
3. mkvirtualenv django2 --python=/usr/bin/python3.6
4. workon django2
5. pip install django
6. pip install django-extensions
7. Go back to web tab
8. Choose the right server if your website is working on more than one
9. Update server to the correct python and django version