title: matplotlib plt.show() only selected objects
body: <p>I have several <code>plt.plot</code> instances and I wanted to only <code>plt.show()</code> certain objects. To illustrate here is some code:</p>
  
  <pre><code>import matplotlib.pyplot as plt
  
  ax1 = plt.plot(range(5),range(5))
  ax2 = plt.plot([x+1 for x in range(5)],[x+1 for x in range(5)])
  ax3 = plt.plot([x+2 for x in range(5)],[x+2 for x in range(5)])
  
  #plt.show([ax1,ax2])
  plt.show()
  </code></pre>
  
  <p>So I would like something like the commented out statement, to display only ax1 &amp; ax2 in the example figure.</p>