[双y轴] 左右Y轴不同的坐标系 #plot

dual_y.py

import matplotlib.pyplot as plt
from datetime import datetime as dt
import os
now =dt.now().strftime('%Y%m%d_%H_%M_%S')
fig = plt.figure()
ax =fig.add_subplot(111)
s.iloc[:,0].plot(ax=ax)
s.iloc[:,1].plot(secondary_y=True)
ax.set_ylabel('市值')
ax.right_ax.set_ylabel('价格')
plt.legend(loc='best')
fig.savefig(now+'.png')
os.system('start '+now+'.png')