class Obj(object):

    def __del__(self):
        raise Exception('in del')

class BrokenObj(object):

    def __del__(self):
        raise Exception('in del')

    def __repr__(self):
        raise Exception('in repr')

print("=== Obj ===")
f = Obj()
del f

print("=== BrokenObj ===")
f = BrokenObj()
del f