title: Sort by name and join in Dataframe
body: <p>I got some data-base and then converted it to pandas DataFrame like this</p>
  
  <pre><code>        food_weight = pd.DataFrame(L, columns=['Week day', 'Date', 'Time','Type',
                                       'Favourites', 'Weight'])
  </code></pre>
  
  <p>lets print it:</p>
  
  <pre><code>    Week day  Date        Time   Type      Favourites        Weight
  0   Thursday  04-09-2020  14:55  lunch      dish1            200
  1   Thursday  04-09-2020  15:17  snack      dish2            100
  2   Thursday  04-09-2020  15:17  snack      dish3            130
  3   Thursday  04-09-2020  19:17  dinner     dish4            115
  4   Monday    04-06-2020  17:41  snack           ----etc-----                       
  5   Monday    04-06-2020  17:46  breakfast                            
  6   Monday    04-06-2020  17:46  lunch                        
  7   Monday    04-06-2020  17:46  snack                                       
  8   Tuesday   04-07-2020  17:57  snack                       
  9   Tuesday   04-07-2020  17:57  snack                                       
  10  Wednesday 04-08-2020  17:57  snack                                 
  11  Friday    04-10-2020  17:57  snack                                   
  12  Saturday  04-11-2020  17:57  snack  
  13  Sunday    04-12-2020  17:57  snack                              
  14  Saturday  11-04-2020  18:06  snack                
  15  Saturday  11-04-2020  18:06  lunch       
  </code></pre>
  
  <p>i'd tried to use <code>food_weight.groupby(['Week day','Date','Type','Time'])['Favourites'].apply(lambda tags: ','.join(tags))</code> and got this:</p>
  
  <pre><code>    Week day  Date        Type   Time         Favourites
  0   Thursday  04-09-2020  lunch  14:55        dish1 
                            snach  15:17        dish2,dish3
                            dinner 19:17        dish4
  </code></pre>
  
  <p>but i need to receive smth like this :(</p>
  
  <pre><code>    Week day  Date        Type   Time         Favourites       Weight
  0   Thursday  04-09-2020  lunch  14:55        dish1            200
                            snach  15:17        dish2,dish3      100,130
                            dinner 19:17        dish4            115                            
                                                   ----etc-----                                      
  </code></pre>
  
  <p><a href="https://github.com/artisakov/vigilant-journey/blob/master/app/diacompanion.db" rel="nofollow noreferrer">Data-base on GitHub</a></p>