title: Histogram color by class
body: <p>I have a pandas dataframe with 2 columns "height" and  "class, class is a column with 3 values 1,2 and 5.
  Now i want to make a histogram of the height data and color by class. <code>plot19_s["vegetation height"].plot.hist(bins = 10)</code></p>
  
  <p>this is my histogram</p>
  
  <p><img src="https://i.stack.imgur.com/ugJGc.png" alt=""></p>
  
  <p>but now I want to see the different classes by a change in color in the histogram.</p>