Auto call to super method when overriding

override.py

class Base(object):
    def __new__(cls, *args, **kwargs):
        obj = super(Base, cls).__new__(cls, *args, **kwargs)
        tmpf = obj.f

        def new_f(*args, **kwargs):
            super(cls, obj).f(*args, **kwargs)
            return tmpf(*args, **kwargs)

        obj.f = new_f
        return obj

    def f(self):
        print 'base f'


class Sub(Base):
    def f(self):
        print "sub f"


if __name__ == '__main__':
    t = Sub()
    t.f()

# output:
# > base f
# > sub f