Python实现TXT文件按固定大小分割与压缩重组

'''
 
为了避免截断中文字符 
文件要求是 unicode 编码 
txt文件另存为对话框下面有下拉框，可选存 
储编码格式 
 
'''
 
import os 
import struct 
#导入所需python模块方法
 
filename = str(raw_input("Please enter an old file name: ")) 
filenamepre = str(raw_input("Please enter an new file name prefix: ")) 
count = 0
filecount = 0
maxcount = 20
newfilename = repr(filecount) + '.txt'
oldfile = open(filename,'rb') 
 
#www.iplaypy.com
bFirst = True
 
while True: 
  s = oldfile.read(512*8 - 4) 
if not s: 
  exit() 
 
filecount = filecount + 1
newfilename = filenamepre + repr(filecount).zfill(2) + '.txt'
newfile = open(newfilename,'wb') 
 
if not bFirst: 
  be = 0XFEFF
  newfile.write(struct.pack('H',be)) 
  newfile.write(s) 
 
be = 0X000A000D
newfile.write(struct.pack('I',be)) 
newfile.close() 
bFirst = False
oldfile.close() 
 
#文件相关操作切记要关闭