def _clear_core_image(self):
    if self._coreimage:
        self._coreimage.unbind(on_load=self._on_source_load)
    super()._clear_core_image()
    self._found_source = None
def _clear_core_image(self):
    if self._coreimage:
        self._coreimage.unbind(on_load=self._on_source_load)
    super()._clear_core_image()
    self._found_source = None