title: How to get the count separately after group by
body: <p><code>df_n_gender_grp = df_n_gender_prod_cat.groupby(['Gender','prod_cat'])</code></p>
  
  <p>My Out is below</p>
  
  <pre><code>    Gender  prod_cat
  0   M   Books
  1   M   Books
  2   M   Electronics
  3   M   Electronics
  4   M   Books
  100 F   Electronics
  101 F   Electronics
  102 F   Electronics
  103 F   Electronics
  104 F   Electronics
  105 F   Clothing
  106 F   Clothing
  107 F   Clothing
  108 F   Clothing
  </code></pre>
  
  <p>My Expected out is</p>
  
  <p>First dataframe  in descending order of values</p>
  
  <pre><code>M Books       2
  M Electronics 3
  </code></pre>
  
  <p>Second dataframe  in descending order of values</p>
  
  <pre><code>F Electronics 5
  F Clothing    4
  </code></pre>