title: Frequency plot in Python/Pandas DataFrame
body: <p>I have a parsed very large dataframe with some values like this and several columns:</p>
  
  <pre><code>Name Age Points ...
  XYZ  42  32pts  ...
  ABC  41  32pts  ...
  DEF  32  35pts
  GHI  52  35pts
  JHK  72  35pts
  MNU  43  42pts
  LKT  32  32pts
  LKI  42  42pts
  JHI  42  35pts
  JHP  42  42pts
  XXX  42  42pts
  XYY  42  35pts
  </code></pre>
  
  <p>I have imported numpy and matplotlib.</p>
  
  <p>I need to plot a graph of the number of times the value in the column 'Points' occurs. I dont need to have any bins for the plotting. So it is more of a plot to see how many times the same score of points occurs over a large dataset. </p>
  
  <p>So essentially the bar plot (or histogram, if you can call it that) should show that 32pts occurs thrice, 35pts occurs 5 times and 42pts occurs 4 times. If I can plot the values in sorted order, all the more better. I have tried df.hist() but it is not working for me. 
  Any clues? Thanks.</p>