title: pandas plot replace xticks
body: <p>I am plotting grouped panda data frame </p>
  
  <pre><code>score = pd.DataFrame()
  score['Score'] = svm_score
  score['Wafer_Slot'] = desc.Wafer_Slot[test_index].tolist()
  
  gscore = score.groupby('Wafer_Slot')
  score_plot = [score for ws, score in gscore]
  
  ax = gscore.boxplot(subplots=False)
  ax.set_xticklabels(range(52)) # does not work
  plt.xlabel('Wafer Slot')
  plt.show()
  </code></pre>
  
  <p>It is working well but the <code>x</code> axis is impossible to read as there are numerous numbers overlapping. I would like the <code>x</code> axis be a counter of the boxplot. </p>
  
  <p>How can I do that?</p>