code: def _set_alternates(self, alts):
          
          alternates_path = osp.join(self.common_dir, 'objects', 'info', 'alternates')
          if not alts:
              if osp.isfile(alternates_path):
                  os.remove(alternates_path)
          else:
              with open(alternates_path, 'wb') as f:
                  f.write("\n".join(alts).encode(defenc))
docs: Sets the alternates
  
          :param alts:
              is the array of string paths representing the alternates at which
              git should look for objects, i.e. /home/user/repo/.git/objects
  
          :raise NoSuchPathError:
          :note:
              The method does not check for the existence of the paths in alts
              as the caller is responsible.