title: matplotlib: any way to get existing colorbars?
body: <p>In matplotlib's object oriented style you can get the current axes, lines and images in an existing figure:</p>
  
  <pre><code>fig.axes
  fig.axes[0].lines
  fig.axes[0].images
  </code></pre>
  
  <p>But I haven't found a way to get the existing colorbars, I have to assign the colorbar a name when first creating it:</p>
  
  <pre><code>cbar = fig.colorbar(image)
  </code></pre>
  
  <p>Is there any way to get the colorbar objects in a given figure if I didn't assign them names?</p>