plt.fill_between() 函数

代码跑一跑就明白了

x = np.linspace(0, 5 * np.pi, 1000)

y1 = np.sin(x)
y2 = np.sin(2 * x)

plt.plot(x, y1, c="b")
plt.plot(x, y2, c='r')

# fill_between 填充两个函数之间的区域
# 两个函数之间的区域用黄色填充
plt.fill_between(x, y1, y2, facecolor="yellow")

plt.show()