wagtaildemo | Old example site implemented with Wagtail | Content Management System library

The permission model built into Wagtail supports this kind of setup: http://docs.wagtail.io/en/stable/topics/permissions.html

After creating the index page for a blog, you'd create a group (Settings -> Groups in the Wagtail admin) for that blog - possibly just containing a single user - and under the 'Page permissions' section, assign it 'add' and 'publish' permission on that index page. Permissions propagate down the tree from that point, and 'add' permission encompasses the ability to edit pages that you've created yourself, so this would have the effect of giving the user control over the subpages of their blog.

This doesn't quite match the setup you've described, since it involves an existing Wagtail admin user having to do the initial setup, rather than users creating their own blog. However, since all of this configuration is done internally by creating / updating standard Django models such as Group and PagePermission, it would be possible in principle to script this process - for example, you could implement a Django view for "Set up my blog" on your site front-end, which runs the following steps:

• Create a BlogIndexPage under /blogs with a title/slug matching request.user.username (see https://stackoverflow.com/a/43041179/1853523 for how to create pages programmatically)
• Create a user group (django.contrib.auth.models.Group) for the current user, and assign them wagtailadmin.access_admin permission (so that they can log in to Wagtail admin)
• Create a wagtailcore.PagePermission object corresponding to the newly-created group and blog index page, and 'add' permission; and likewise for 'publish' permission

It seems that you have two python 2.7 installed, perhaps a built in one, and a manually installed one. The one that shows the import error uses the python located at: