import matplotlib.pyplot as plt
import numpy as np
x = np.linspace(0, 1, num=10)
y1 = x ** 2
y2 = -x ** 2
fig = plt.figure()
ax1 = fig.add_subplot(111)
ax1.plot(x, y1, 'r', label="y1")
ax1.set_ylabel('y1')
ax2 = ax1.twinx()
ax2.plot(x, y2, 'g', label="y2")
fig.legend()
ax2.set_ylabel('y2')
ax2.set_xlabel('x')
plt.show()
![在这里插入图片描述](https://img-blog.csdnimg.cn/20210109210507928.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQ4Njc4MA==,size_16,color_FFFFFF,t_70)
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