title: How to create custom legend in matplotlib based on the value of the barplot?
body: <p>Supposedly, I have barplot as below:</p>
  
  <p><img src="https://i.stack.imgur.com/JrEqx.png" alt="Sample BarPlot"></p>
  
  <p>The Day of Week 4 is for example refer to Wednesday, is it possible to create custom legend which indicate 4 - Wednesday?</p>
  
  <p>And also, if I have Day of Week, such as 3, and 4. 3 is for Tuesday. How possible to add another legend in the custom legend (3 - Tuesday) if only day of week 3 is displayed in the bar plot?</p>
  
  <p>Thanks!</p>