def handle_response(self, message, addr):
        raise NotImplementedError
Mtime is set as a function to make it lazily computed via this property
dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/protocols/sip.py/Base.handle_response--crossover with--dataset/ETHPy150Open realestate-com-au/harpoon/harpoon/option_spec/image_objs.py/Image.mtime