def update_low_on_enter(self):
        try:
            try:
                low = eval(unicode(self._label_lo.text()).strip())
                if self.evaluate is not None:
                    low = self.evaluate(low)
            except Exception as ex:
                low = self.low
                self._label_lo.setText(self.format % self.low)

            if not self.factory.is_float:
                low = int(low)

            if low > self.high:
                low = self._step_size() - self.high
                self._label_lo.setText(self.format % low)

            self.control.slider.setLow(self._convert_to_slider(low))
            self.low = low
        except:
            pass
dataset/ETHPy150Open enthought/traitsui/traitsui/qt4/extra/bounds_editor.py/_BoundsEditor.update_low_on_enter/swapped operands of `-`