PySignals is a signal dispatcher module for Python, extracted from "django.dispatch" in the Django framework so it can be used in applications without requiring the entire Django framework to be installed.
If you have setuptools you can use easy_install -U pysignals. Otherwise, you can download the source from GitHub and run python setup.py install.
PySignals is directly extracted from the Django framework, therefore the best place to get documentation is from the Django Signals Documentation.
The only difference is that all occurrences of django.dispatch should be replaced by pysignals.