双Y轴图形Legend配置

 

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x = np.arange(0,101)     wn = np.random.rand(101) y1 = -1+0.02*x+0.1*wn   y2 = np.sin(0.5*x) y3 = 0.0001*x**2-0.03*x+1 y4 = 0.8*np.cos(x)   fig,ax1 = plt.subplots() ax1.scatter(x,y1,c='r',marker ='*',label = 'line1') ax1.plot(x,y2,'g-o',label = 'line2')   ax2 = ax1.twinx() ax2.plot(x,y3,'b-+',label='line3') ax2.plot(x,y4,'m--',label='line4')   lines1, labels1 = ax1.get_legend_handles_labels() lines2, labels2 = ax2.get_legend_handles_labels() ax2.legend(lines1 + lines2, labels1 + labels2, loc=0)   plt.show()