My plot in ipython does not show with pyplot.show()

Help required displaying matplotlib plots in ipython. I did not forget to call pyplot.show().

$ ipython --pylab

import matplotlib.pyplot as plt
plt.plot(range(20), range(20))

It returns matplotlib.lines.Line2D at 0xade2b2c as the output.

plt.show()

Nothing happens. No error message. No new window. I installed matplotlib with pip, and no error messages occurred.

Details:

I use,

• Ubuntu
• IPython v0.11
• Python v2.6.6
• matplotlib v1.0.1