from pylab import *

couleurs = ['b', 'g', 'r', 'c', 'm', 'y', 'k', 'w']

x = [-1, 0, 1, 2]
y = [3, 2, 4, 1]

for c in couleurs:
    i = couleurs.index(c) + 1
    subplot(2, 4, i)
    plot(x, y, c+'-')
 
show()