人口练习

绘制野兔、猞猁和胡萝卜的数量

import numpy as np
import matplotlib.pyplot as plt

data = np.loadtxt("../../../data/populations.txt")
year, hares, lynxes, carrots = data.T

plt.axes((0.2, 0.1, 0.5, 0.8))
plt.plot(year, hares, year, lynxes, year, carrots)
plt.legend(("Hare", "Lynx", "Carrot"), loc=(1.05, 0.5))
plt.show()