list indices must be integers or slices, not tuple

y=[np.float64(i) for i in y]  #解决string造成的图像坐标乱序
x=[np.float64(i) for i in x]
y = np.array(y).reshape((len(y),1))
x = np.array(x)

借鉴：

python作图Y轴排序混乱原因和方法