@property
def operation_cycle(self):
    return dict(zip(('fill_1', 'fill_2', 'mix_1', 'mix_2', 'settle', 'decant', 'desludge'), self._operation_cycle))
@property
def operation_cycle(self):
    return dict(zip(('fill_1', 'fill_2', 'mix_1', 'mix_2', 'settle', 'decant', 'desludge'), self._operation_cycle))