refcount.py

class Foo(object):
    def __init__(self, what):
        self.what = what

    def butts(self):
        def inner_butts(self, t):
            if t == 0:
                return self.what
            else:
                return t + inner_butts(self, t-1)

        return inner_butts(self, 10)

    def __del__(self):
        print "Cleaning up"

print "A"
print Foo(20).butts()
print "B"