title: Plotting boxplots for a groupby object
body: <p>I would like to plot boxplots for several datasets based on a criterion.
  Imagine a dataframe similar to the example below:</p>
  
  <pre><code>df = pd.DataFrame({'Group':[1,1,1,2,3,2,2,3,1,3],'M':np.random.rand(10),'F':np.random.rand(10)})
  df = df[['Group','M','F']]
  
     Group         M         F
  0      1  0.465636  0.537723
  1      1  0.560537  0.727238
  2      1  0.268154  0.648927
  3      2  0.722644  0.115550
  4      3  0.586346  0.042896
  5      2  0.562881  0.369686
  6      2  0.395236  0.672477
  7      3  0.577949  0.358801
  8      1  0.764069  0.642724
  9      3  0.731076  0.302369
  </code></pre>
  
  <p>In this case, I have three groups, so I would like to make a boxplot for each group and for M and F separately having the groups on Y axis and the columns of M and F colour-coded.
  <a href="https://stackoverflow.com/questions/16592222/matplotlib-group-boxplots">This answer</a> is very close to what I want to achieve, but I would prefer something more robust, applicable for larger dataframes with greater number of groups. I feel that groupby is the way to go, but I am not familiar with groupby objects and I am failing to even slice them.
  . The desirable output would look something like this:<a href="https://i.stack.imgur.com/JEbh7.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/JEbh7.png" alt="enter image description here"></a></p>
  
  <p>Looks like years ago, someone had the same problem, but got no answers :( <a href="https://stackoverflow.com/questions/31976640/using-matplotlib-boxplot-with-groupby?rq=1">Having a boxplot as a graphical representation of the describe function of groupby</a></p>
  
  <p><strong>My questions are:</strong></p>
  
  <ol>
  <li>How to implement groupby to feed the desired data into the boxplot</li>
  <li>What is the correct syntax for the box plot if I want to control what is displayed and not just use default settings (which I don't even know what they are, I am finding the documentation rather vague. To be specific,can I have the box covering the mean +/- standard deviation, and keep the vertical line at median value?)</li>
  </ol>