title: Duplicated colorbars when creating an animation
body: <p>I am new to matplotlib. When I generate a series of contourf plots with a loop, matplotlib creates n duplicated colorbars (the colorbar has a fixed range)</p>
  
  <p>Must I destroy the old colorbar for each loop, if so how do I do that?</p>
  
  <p>Update:</p>
  
  <p>Ok, but if I generate a colorbar for a contourf plot. How do I make sure that the entire extent of the scale is included. I have tried using "clip=False" &amp; extend='both'</p>
  
  <pre><code>c_scale = matplotlib.colors.Normalize(vmin=0, vmax=1,clip=False)
  cbar = plt.colorbar(cmap=plt.cm.jet,norm=c_scale,shrink=0.5,extend='both')
  </code></pre>