def format(self, x, y, _width):
        self.attrs['d'] = 'M {0} {1} v 20 m 10 -20 v 20 m -10 -10 h 20.5'.format(x, 10 - y)
        return self
dataset/ETHPy150Open tabatkins/bikeshed/bikeshed/railroaddiagrams.py/Start.format/swapped operands of `-`