pythone memo int.from_bytesの使い方

#batch example
#cd /d %~dp0
#python bin2asc2.py %1
import sys
import pathlib

infile = sys.argv[1]
outfile = pathlib.PurePath(infile).stem + ".csv"

with open(infile, 'rb') as fr:
   with open(outfile, 'w') as fw:
       while True:
           data = fr.read(1)
           if data:
               buf = int.from_bytes(data, byteorder='big')
               fw.write ("0x%08x,%d\n" % (abc,buf))
           else:
               break