title: python - bokeh - stacked bar chart with conditional coloring
body: <p><strong>how to detach height of the stacked bars from colors of the fill?</strong></p>
  
  <p>I have multiple categories which I want to present in stacked bar chart so that the height represent the value and color is conditionally defined by another variable (something like fill= in the ggplot ).</p>
  
  <p>I am new to bokeh and struggling with the stack bar chart mechanics. I tried construct this type of chart, but I haven't got anything except all sorts of errors. The examples of stacked bar chart are very limited in the bokeh documentation.</p>
  
  <p>My Data is stored in pandas dataframe:</p>
  
  <pre><code>data =
  ['A',1, 15, 1]
  'A',2, 14, 2
  'A',3, 60, 1
  'B',1, 15, 2
  'B',2, 25, 2
  'B',3, 20, 1
  'C',1, 15, 1
  'C',2, 25, 1
  'C',3, 55, 2
  ...
  ]
  </code></pre>
  
  <p><strong>Columns represent Category, Regime, Value, State.</strong></p>
  
  <p><strong>I want to plot Category on x axis, Regimes stacked on y axis where bar length represents Value and color represents State.</strong></p>
  
  <p>is this achievable in bokeh?
  can anybody demonstrate please</p>