matplotlib(一）

import numpy as np
import matplotlib.pyplot as mp

x = np.linspace(-np.pi, np.pi, 1000)
y = np.sin(x)
z = np.cos(x)
# mp.plot(x, y)

xvals = [-np.pi, -np.pi / 2, 0, np.pi / 2, np.pi]
texts = [r'$-pi$', r'$-frac{pi}{2}$', '0', r'$frac{pi}{2}$', r'$pi$']
mp.xticks(xvals, texts)
mp.plot(x, z)
mp.show()