title: matplotlib does not show my drawings although I call pyplot.show()
body: <p>Help required on matplotlib. Yes, I did not forget calling the pyplot.show().</p>
  
  <h3>$ ipython --pylab</h3>
  
  <pre><code>import matplotlib.pyplot as p 
  p.plot(range(20), range(20))
  </code></pre>
  
  <p>It returns <code>matplotlib.lines.Line2D at 0xade2b2c</code> as the output.</p>
  
  <pre><code>p.show()
  </code></pre>
  
  <p>There is nothing to happen. No error message. No new window. Nothing. I install <code>matplotlib</code> by using pip and I didn't take any error messages. </p>
  
  <p>Details:</p>
  
  <p>I use,</p>
  
  <ul>
  <li>Ubuntu</li>
  <li>IPython v0.11</li>
  <li>Python v2.6.6</li>
  <li>matplotlib v1.0.1</li>
  </ul>