Comment trier la commande dans plusieurs pandas d'index

In [1]: grouped.sortlevel(["Manufacturer","Product Launch Date"], sort_remaining=False)

                                               Sales
Manufacturer Product Name Product Launch Date       
Apple        iPod         2001-10-23              34
             iPad         2010-04-03              30
Samsung      Galaxy       2009-04-27              24
             Galaxy Tab   2010-09-02              22
Lonely Louse