title: Seaborn displot with two y axes
body: <p>How do I create a histogram using Seaborn's displot with two y axes: one showing count and the other showing the corresponding density? I tried this code but the result does not make sense:</p>
  
  <pre><code>ax = sns.distplot( df_flavors.Freq, kde = False )
  ax.set_title( 'Distribution of Flavor Purchases\nNumber Purchased', fontsize = font_title )
  ax.set( ylabel = 'Count', xlabel = 'Number of Flavors Purchased' )
  ax.set_xticks( range( n ))
  ax.set_xticklabels( range( n ) )
  ##
  ax2 = plt.twinx()
  </code></pre>
  
  <p>The DataFrame df_flavors is a large DataFrame with 2000 records, each showing how many different flavors of yogurts people bought (0 - 7 flavors).  The people are respondents to a survey with n = 2000.  The variable Freq is the count for each respondent. The sns.distplot produces the count on the left axis; that's ok.  The ax2 = plt.twinx() produces a second y-axis but not percents on that axis, just cumulative percents; that's not ok.  Any suggestions for getting just percent or density of the total 2000 on the right?</p>