import numpy as np

import matplotlib.pyplot as plt

from pylab import *

x = np.arange(1.,2.,0.2)  # 1到2，间隔0.2

y1 = np.arange(1.,2.,0.2)

plt.figure(1)      # 画一张图

plt.subplot(311)   # 3行一列

plt.plot(x, y1,'r*')

plt.subplot(312)

plt.figure(1)

plt.plot([1,2,3,4], [1,2,2,4],'bo')

plt.subplot(313)

# evenly sampled time at 200ms intervals

t = np.arange(0., 5., 0.2)

# red dashes, blue squares and green triangles

plt.plot(t, t, 'r--', t, t**2, 'bs', t, t**3, 'g^')

plt.show()  # 显示图片