A simple implementation of the observer pattern.
import observer
# Create a subject and list the events it might fire
foo = observer.Subject('bar', 'baz')
# Add a listener
def foo_bar_listener(*args):
print("heard 'bar'", args)
foo('bar', foo_bar_listener)
# fire events
foo.fire('bar', 1, 2, 3)
# -> heard 'bar' (1, 2, 3)
# Trying to listen to an unregistered event throws an error
foo('snorble', lambda: None)
# -> AssertionError: snorble is not a valid event for this subject
# Same with trying to fire an unregistered event
foo.fire('snorble')
# -> AssertionError: snorble is not a valid event for this subject1 maintainer
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