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    def do_dispatch(self, listeners, event):
        for listener in listeners:
            listener(event)
            if event.propagation_stopped: break

   from typing import Callable
    def do_dispatch(self, listeners, event):
       # Using type hinting
        listener: Callable
        for listener in listeners:
            # Or, using isinstance
            if not isinstance(listener, Callable):
               raise InvalidListener()
            listener(event)
            if event.propagation_stopped: break