docs: def human_filesize(i):
      """
      'human-readable' file size (i.e. 13 KB, 4.1 MB, 102 bytes, etc).
      """
      bytes = float(i)
      if bytes < 1024:
          return u"%d Byte%s" % (bytes, bytes != 1 and u"s" or u"")
      if bytes < 1024 * 1024:
          return u"%.1f KB" % (bytes / 1024)
      if bytes < 1024 * 1024 * 1024:
          return u"%.1f MB" % (bytes / (1024 * 1024))
      return u"%.1f GB" % (bytes / (1024 * 1024 * 1024))