Python：（使用matplotlib画图）次坐标轴，两个坐标轴

 

 

代码如下

import matplotlib.pyplot as plt
import numpy as np

x = np.arange(0,10,0.1)

y1 = 0.05 * x**2
y2 = -1 * y1

fig, ax1 = plt.subplots()
ax2 = ax1.twinx()
ax1.plot(x,y1,'g-')
ax2.plot(x,y2,'b-')

ax1.set_xlabel("X data")
ax1.set_ylabel("Y1",color='g')

ax2.set_ylabel("Y2",color='b')

plt.show()