When you create a new Divio Cloud project, you're offered a choice of project types.
If you opt to create a Python-based project, the available types are:
Django will be installed and configured, connected to its database, S3 storage and other backing services, and wired up to our web delivery infrastructure.
It's ready for you to start adding your own custom Django functionality.
django CMS or Wagtail? They are both widely-used, reliable, proven content management systems, used in small and large sites. They take different approaches, but it's not really possible to give a straightforward answer about which to choose for your needs.
You don't even need to install Python. We can provide a hosting environment for you to do with as you wish, including a number of boilerplates with various useful components wired up.