def __eq__(self, other):
        return (isinstance(other, self.__class__) and
                other.package == self.package)
def on_upper_bound_changed(self):
        self.ui.spinBoxLowerBound.setMaximum(self.ui.spinBoxUpperBound.value() - 1)
        self.ui.spinBoxBoundaryNumber.setMaximum(math.ceil((self.ui.spinBoxUpperBound.value()
                                                            - self.ui.spinBoxLowerBound.value()) / 2))