class Super:
def method(self):
print('in Super.method') # Default behavior
def delegate(self):
self.action() # Expected to be defined
class Inheritor(Super): # Inherit method verbatim
pass
class Replacer(Super): # Replace method completely
def method(self):
print('in Replacer.method')
class Extender(Super): # Extend method behavior
def method(self):
print('starting Extender.method')
Super.method(self)
print('ending Extender.method')
class Provider(Super): # Fill in a required method
def action(self):
print('in Provider.action')
if __name__ == '__main__':
for klass in (Inheritor, Replacer, Extender):
print('\n' + klass.__name__ + '...')
klass().method()
print('\nProvider...')
x = Provider()
x.delegate()