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tools/dusk/event.py

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+class Event:
+  def __init__(self):
+    self._subscribers = []
+
+  def sub(self, callback):
+    """Subscribe a callback to the event."""
+    if callback not in self._subscribers:
+      self._subscribers.append(callback)
+
+  def unsub(self, callback):
+    """Unsubscribe a callback from the event."""
+    if callback in self._subscribers:
+      self._subscribers.remove(callback)
+
+  def invoke(self, *args, **kwargs):
+    """Invoke all subscribers with the given arguments."""
+    for callback in self._subscribers:
+      callback(*args, **kwargs)