A Python publish-subcribe library (I moved it from SourceForge.net)
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Dec 2016: pypubsub 4.0.0 released!


PyPubSub provides a publish - subscribe API that facilitates the development of event-based / message-based applications. PyPubSub supports sending and receiving messages between objects of an application. It is centered on the notion of a topic; senders publish messages of a given topic, and listeners subscribe to messages of a given topic. The package also supports a variety of advanced features that facilitate debugging and maintaining pypubsub topics and messages in larger applications.

Install most recent stable with "pip install pypubsub".

Useful links: