python二进制读写文件

#coding=gbk
'''
Created on 2014-5-7

'''
import os.path

inputPath = './input.txt'
outPath = './out.txt'

bufferSize = 10

inputFile = open(inputPath, 'rb')
outFile = open(outPath, 'wb+')

fileSize  = os.path.getsize(inputPath)

readedSize = 0

while readedSize < fileSize -  bufferSize :

    tmp = inputFile.read(bufferSize)
    outFile.write(tmp)
    readedSize = readedSize + bufferSize

#读取剩下的部分
tmp = inputFile.read(fileSize % bufferSize)
outFile.write(tmp)

inputFile.close()
outFile.close()   

print 'done'