Python's super(), abstract base classes, and NotImplementedError

Question

Abstract base classes can still be handy in Python. In writing an abstract base class where I want every subclass to have, say, a spam() method, I want to write som

Answer 1

You can do this cleanly in python 2.6+ with the abc module:

import abc
class B(object):
    __metaclass__ = abc.ABCMeta
    @abc.abstractmethod
    def foo(self):
        print 'In B'

class C(B):
    def foo(self):
        super(C, self).foo()
        print 'In C'

C().foo()

The output will be

In B
In C