mwclient 0.6.3 has been released. This version is required for usage on Wikimedia wikis.
mwclient 0.6.2 will not work on Wikimedia wikis, because the version detector does not understand the recently introduced 1.16alpha-wmf version. I committed a temporary hack, which will later probably be removed in favor of something better.
Mwclient is a Python library that allows easy access to the MediaWiki API and should be more or less usable on MediaWiki 1.11 or higher and should graciously fallback when the write api is disbled.
See http://apps.sourceforge.net/mediawiki/mwclient/ for download links.
Bryan