def _ZeroPoint(self, chart):
    """Get the zero-point if any bars are negative."""
    # (Maybe) set the zero point.
    min, max = chart.GetDependentAxis().min, chart.GetDependentAxis().max
    out = {}
    if min < 0:
      if max < 0:
        out['chp'] = 1
      else:
        out['chp'] = -min/float(min - max)
    return out
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/graphy/graphy/backends/google_chart_api/encoders.py/BarChartEncoder._ZeroPoint/swapped operands of `-`