Python 分割TXT文件成4K的TXT文件

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Python 分割TXT文件成4K的TXT文件
# #
# 為了避免截斷中文字符 #
# 文件要求是 unicode 編碼 #
# txt文件另存為對話框下面有下拉框，可選存 #
# 儲編碼格式 #
# #
##########################
import os
import struct
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')
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()