python使用pylab一幅图片画多个图

import numpy as np
import pylab as pl

if __name__ == '__main__':
    fig = pl.figure(figsize=(10, 5))
    ax = fig.add_subplot(121)
    toplot = np.random.randint(0, 255, [40, 40])
    pl.text(1, 3, 'Left picture', fontsize=20)
    pl.imshow(toplot)
    ax = fig.add_subplot(122)
    toplot = np.random.randint(0,   2, [40, 40])
    pl.text(1, 3, 'Right picture', fontsize=20)
    pl.imshow(toplot)
    pl.savefig('image_%d.png' % 0)