Method setter

Lib/test/test_abc.py:237–238

(self, callable)

                def getter(self, callable):
                    return Descriptor(callable, self._fget)
                def setter(self, callable):
                    return Descriptor(self._fget, callable)
                @property
                def __isabstractmethod__(self):
                    return (getattr(self._fget, '__isabstractmethod__', False)