title: How to avoid axis values with 1e7 in pandas and matplotlib
body: <p>Using the code below it produce a plot where y-axis is 0.0 to 2.5 1e7. How is it possible to avoid values with 1e7?</p>
  
  <pre><code>    import pandas as pd
      import matplotlib.pyplot as plt
      a = {'Test1': {1: 21867186, 4: 20145576, 10: 18018537},
           'Test2': {1: 23256313, 4: 21668216, 10: 19795367}}
  
      d = pd.DataFrame(a).T
      #print d
  
      f = plt.figure()
  
      plt.title('Title here!', color='black')
      d.plot(kind='bar', ax=f.gca())
      plt.show()
  </code></pre>