如何在python的matplotlib中填充直线的上方和下方

import matplotlib.pyplot as plt
import numpy as np

x = np.linspace(0, 10, 100)
y1 = np.sin(x)
y2 = np.cos(x)

plt.plot(x, y1, label='sin(x)')
plt.plot(x, y2, label='cos(x)')
plt.fill_between(x, y1, y2, where=(y1 > y2), color='green', alpha=0.3)
plt.fill_between(x, y1, y2, where=(y1 <= y2), color='red', alpha=0.3)

plt.legend()
plt.show()