title: Adding vertical lines to matplotlib grouped barplot
body: <p>I have a dataframe as below:</p>
  <pre><code>ORDER   TYPE    CURRENT_PRICE   MAX_PRICE   MIN_PRICE
  1500    AA      6255            7257        4356
  1500    BB      6822            7109        4102
  1510    AA      6853            7439        4650
  1510    BB      6986            7177        4412
  1520    AA      6676            7064        4754
  1520    BB      6239            7404        4217
  1530    AA      6620            7886        4511
  1530    BB      6609            7587        4248
  1540    AA      6854            7540        4387
  1540    BB      6040            7292        4246
  1550    AA      6547            7339        4850
  1550    BB      6581            7925        4238
  </code></pre>
  <p>I want to plot both TYPE (AA, BB) with Group-by on ORDER column. For each TYPE the CURRENT_PRICE should be a bar with corresponding MAX_PRICE &amp; MIN_PRICE to marked in each bar.</p>
  <p>I want something like below: (Black Bar representing MAX_PRICE &amp; MIN_PRICE)
  <a href="https://i.stack.imgur.com/FYaV5.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/FYaV5.png" alt="Desired_Output" /></a></p>