title: how to make a 3d effect on bars in matplotlib?
body: <p>I have a very simple basic bar's graphic like this one
  <img src="https://i.stack.imgur.com/gGJi2.png" alt="alt text"></p>
  
  <p>but i want to display the bars with some 3d effect, like this 
  <img src="https://i.stack.imgur.com/CsaSl.gif" alt="alt text"></p>
  
  <p>I just want the bars to have that 3d effect...my code is:</p>
  
  <pre><code>fig = Figure(figsize=(4.6,4))
  ax1 = fig.add_subplot(111,ylabel="Valeur",xlabel="Code",autoscale_on=True)
  
  width = 0.35
  ind = np.arange(len(values))
  rects = ax1.bar(ind, values, width, color='#A1B214')
  ax1.set_xticks(ind+width)
  ax1.set_xticklabels( codes )
  ax1.set_ybound(-1,values[0] * 1.1)
  canvas = FigureCanvas(fig)
  response = HttpResponse(content_type='image/png')
  canvas.print_png(response)
  </code></pre>
  
  <p>i've been looking in the gallery of matplotlib,tried a few things but i wasn't lucky, Any ideas? Thxs</p>