Event Dispatcher and callback list for Python
eventpy is a Python event library that provides tools that enable your application components to communicate with each other by dispatching events and listening for them. With eventpy you can easily implement signal/slot mechanism, or observer pattern.
This library is the Python version rewritten from the C++ library eventpp, both are developed by the same developer.
Apache License, Version 2.0
eventpy is currently usable and stable.
https://github.com/wqking/eventpy
pip install eventpy
eventpy
# create a CallbackList
callbackList = CallbackList()
callbackList.append(lambda s, b : print("Got callback 1, s is %s b is %d" % (s, b)))
def anotherCallback(s, b) :
print("Got callback 2, s is %s b is %d" % (s, b))
callbackList.append(anotherCallback)
# Invoke the callback list
callbackList("Hello world", True)
# create an EventDispatcher
dispatcher = EventDispatcher()
dispatcher.appendListener(3, lambda s, b : print("Got event 3, s is %s b is %d" % (s, b)))
dispatcher.appendListener(5, lambda s, b : print("Got event 5, s is %s b is %d" % (s, b)))
dispatcher.appendListener(5, lambda s, b : print("Got another event 5, s is %s b is %d" % (s, b)))
# Dispatch the events, the first argument is always the event type.
dispatcher.dispatch(3, "Hello", True)
dispatcher.dispatch(5, "World", False)
# create an EventQueue
queue = eventqueue.EventQueue()
queue.appendListener(3, lambda s, n : print("Got event 3, s is %s n is %d" % (s, n)))
queue.appendListener(5, lambda s, n : print("Got event 5, s is %s n is %d" % (s, n)))
queue.appendListener(5, lambda s, n : print("Got another event 5, s is %s n is %d" % (s, n)))
# Enqueue the events, the first argument is always the event type.
# The listeners are not triggered during enqueue.
queue.enqueue(3, "Hello", 38)
queue.enqueue(5, "World", 58)
# Process the event queue, dispatch all queued events.
queue.process();
Go to the root folder of eventpy, run python -m pytest