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class Event:

def __init__(self, name):

self.name = name

def __str__(self):

return self.name

class Widget:

def __init__(self, parent=None):

self.parent = parent

def handle(self, event):

handler = f'handle_{event}'

if hasattr(self, handler):

method = getattr(self, handler)

method(event)

elif self.parent is not None:

self.parent.handle(event)

elif hasattr(self, 'handle_default'):

self.handle_default(event)

class MainWindow(Widget):

def handle_close(self, event):

print(f'MainWindow: {event}')

def handle_default(self, event):

print(f'MainWindow Default: {event}')

class SendDialog(Widget):

def handle_paint(self, event):

print(f'SendDialog: {event}')

class MsgText(Widget):

def handle_down(self, event):

print(f'MsgText: {event}')

def main():

mw = MainWindow()

sd = SendDialog(mw)

msg = MsgText(sd)

for e in ('down', 'paint', 'unhandled', 'close'):

evt = Event(e)

print(f'Sending event -{evt}- to MainWindow')

mw.handle(evt)

print(f'Sending event -{evt}- to SendDialog')

sd.handle(evt)

print(f'Sending event -{evt}- to MsgText')

msg.handle(evt)

if __name__ == '__main__':

main()