Replace ars.lib.pydispatch with Django's django.dispatch
"""Multi-consumer multi-producer dispatching mechanism
Originally based on pydispatch (BSD) http://pypi.python.org/pypi/PyDispatcher/2.0.1 See license.txt for original license.
Heavily modified for Django's purposes. """
I think it is a much better option because it provides a
Signal class that allows to define a signal better (currently they are just strings! collisions are possible), specifying the handler's interface (i.e. arguments). It seems to have been performance upgraded, and have cleaner code.