Here is a list of known Python-based WikiEngines
CMFWiki -- a ZwiKi variant; old but compatible with Zope's CMF (Content Management Framework).
CyberPublishing -- a wiki-based web publishing framework written in Python; GPL
Hatta -- a Wiki which runs out of a Mercurial repository whose pages are just the files in that repository
Luminotes -- a WYSIWYG personal wiki notebook for organizing your notes and ideas
Markdoc -- a lightweight Markdown-based Wiki system
MoinMoin -- A PythonLanguage SourceForge project, based on PikiPiki - runs as cgi, FastCGI, ModPython, Twisted or with standalone server, extensible design - everything is a plugin, lots of plugins and large community of users (including this web site), GPL.
MonkeyWiki -- Simple install/use, single file, very flexible templating, rewrite-friendly (based on PikiPiki)
Not-Yet-Named Wiki -- runs on Webware. Supports static publishing, WYSIWYG editing, ReStructuredText. Still in rapid initial development phase (as of Apr 2004).
PikiePikie -- Python-based, lets you put a WebLog on any page (based on PikiPiki)
PikiPiki -- Python-based, will run completely standalone
Pwyky -- WyPy's big brother, by the same author.
PyleWiki -- Python-based, optional CVS backend, Unix-like rwxrwxrwx permissions on pages
PyWiki -- Python-based, uses RCS, GPL license (development stalled)
Sphene Community Tools -- Django based wiki and forum applications.
Sycamore -- seems to have roots in MoinMoin, but looks a little slicker while not as full featured. Uses a Postgesql or MySQL backend. GPL
Trac -- an enhanced wiki and issue tracking system for software development projects. Supports MoinMoin-style, ReStructuredText, html, and textile as markup formats. Runs as cgi, FastCGI, ModPython, or with standalone server. Pluggable architecture with focus on simplicity.
WikiForNow -- an old ZwiKi variant; used at zope.org; was meant to get a number of improvements implemented quickly, but has not evolved with usage patterns
WikiNehesa -- Many features, including images, headerbars, TEXT centering, image inventory/previewer, image uploader. Modular. $FREE$. GNU GPL.
WyPy -- a ShortestWikiContest contender, 23-, 18-, and 11-line versions.