code: def get_formatted_size(self):
          
  
          if self.size is not None:
              if self.size < 1024:
                  return "{0} B".format(self.size)
              elif self.size < 1024 ** 2:
                  return "{0} KiB".format(round(self.size / 1024, 2))
              elif self.size < 1024 ** 3:
                  return "{0} MiB".format(round(self.size / 1024 ** 2, 2))
              elif self.size < 1024 ** 4:
                  return "{0} GiB".format(round(self.size / 1024 ** 3, 2))
              else:
                  return "{0} TiB".format(round(self.size / 1024 ** 4, 2))
          else:
              return self.size
docs: Obtains the size of the volume in a human-readable format (i.e. in TiBs, GiBs or MiBs).