notes-computer-programming-python-plugins

search terms:

• "component architecture"
• plugin architecture
• "component architecture" python
• plugin architecture python

Non-Python examples of component architectures with plugins:

• firefox's "extensions"
• Mac OS X Core Foundation's Plug-in facility
• Eclipse's Plug-in architecture

Python projects/libraries with plugin systems:

• http://pypi.python.org/pypi/Plugins (BSD-style, i think) (from PJE)
• Trac (see Trac:PluginDevelopment and Trac:ComponentArchitecture)

Mercurial has extensions, but afaik they can only add additional commands, they can't modify the functioning of existing ones.

Notification (pub/sub, or publish/subscribe) systems

• http://pypi.python.org/pypi/Trellis (BSD-style, i think) (from PJE)
• http://pypi.python.org/pypi/py-notify (Lesser GPL)
• http://docs.djangoproject.com/en/dev/topics/signals/#django.dispatch.Signal (BSD)