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.
- Powerful
- Supports synchronous event dispatching and asynchronous event queue.
- Configurable and extensible with policies.
- Robust
- Supports nested event. During the process of handling an event, a listener can safely dispatch event and append/prepend/insert/remove other listeners.
- Thread safety. Supports multi-threading.
- Well tested. Backed by unit tests.
- Flexible and easy to use
- Listeners and events can be of any type and do not need to be inherited from any base class.
- Requires Python 3. Tested with Python 3.7 and Cython.
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();- Overview
- Tutorials of CallbackList
- Tutorials of EventDispatcher
- Tutorials of EventQueue
- Class CallbackList
- Class EventDispatcher
- Class EventQueue
- Policies -- configure eventpy
- There are runnable tutorials in the unit tests.
Go to the root folder of eventpy, run python -m pytest
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