What is the output of the following? “`python class EventMixin: def trigger(self, name): handler = getattr(self, f’on_{name}’, None) if callable(handler): return handler() return None class App(EventMixin): def on_start(self): return ‘started’ app = App() print(app.trigger(‘start’)) print(app.trigger(‘stop’)) “`

Question

Python Developer — Hard

What is the output of the following? “`python class EventMixin: def trigger(self, name): handler = getattr(self, f’on_{name}’, None) if callable(handler): return handler() return None class App(EventMixin): def on_start(self): return ‘started’ app = App() print(app.trigger(‘start’)) print(app.trigger(‘stop’)) “`

Accepted Answer

The output of the code is 'started', None. The trigger method in the EventMixin class checks if the handler is callable and returns the result. Since 'on_start' method is defined in the App class, it returns 'started' for 'start' event.