maxcutler/python-wordpress-xmlrpc — pull request #35 by CloCkWeRX (2012-08-30 09:01:24+00:00)
Title: Add support for comment that do not provide credentials

Not all comments need to be authenticated.

From http://codex.wordpress.org/XML-RPC_WordPress_API/Comments#wp.newComment

Note on Anonymous Comments
By default, the username and password parameters are required. However, if you wish to allow anonymous comments, you can use the xmlrpc_allow_anonymous_comments filter:

add_filter( 'xmlrpc_allow_anonymous_comments', '__return_true' );