We don’t have a dump of the wiki publicly available, since this would include lots of PII and also a few private pages which we cannot easily make public.
Now, the main question is: Why would you want to have access to such a dump ?
The public contents are available, the history of each page is available as well and pages can easily be edited - you just need to ask for editor permissions by sending an email to pydotorg-www mailing list.
The source is OSS and available from https://moinmo.in/. The moin team is currently working on a version 2.0 and we are planning to migrate to this new version once it’s stable enough.
The theme we use is available as well via a repo I created for this purpose. I can take changes from there and then install them on the prod system.
PS: I am one of the wiki admins.