PyXMPP is a Python XMPP (RFC 3920,3921) and Jabber (http://www.jabber.org/protocol/) implementation. It is based on libxml2 -- fast and fully-featured XML parser.
PyXMPP provides most core features of the XMPP protocol and several JSF-defined extensions. PyXMPP provides building blocks for creating Jabber clients and components. Developer uses them to setup XMPP streams, handle incoming events and create outgoing stanzas (XMPP "packets").