code: def format_size(self, bytes):
          
          # b
          if bytes < 1024:
              return "{}{}".format(colorize(round(
                  bytes, 2), "purple"),
                  bold("bytes"))
          # kb
          elif bytes < (1024*1000):
              return "{}{}".format(colorize(round(
                  bytes/1024, 2), "purple"),
                  bold("kB"))
          # mb
          elif bytes < (1024*1024):
              return "{}{}".format(colorize(round(
                  bytes/1024, 2), "purple"),
                  bold("MB"))
docs: Pretty-formats given bytes size in a readable manner
              @bytes: #int or #float bytes
  
              -> #str formatted bytes