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import numpy as npimport matplotlib.pyplot as pltx = np.arange(0, 10, 0.1)y1 = 0.5 * x**2y2 = -1 *y1fig, ax1 = plt.subplots()ax2 = ax1.twinx()ax1.plot(x, y1, 'g-')ax2.plot(x, y2, 'b-')ax1.set_xlabel('X ')ax1.set_ylabel('Y1 ', color='g')ax2.set_ylabel('Y2 ', color='b')#ax1.set_xticklabels(keys, rotation='vertical', size=8)#上面这个是设置x轴坐标的函数plt.show()