python文件拆分与重组实例

文件拆分代码：

#-*-encoding:utf-8-*-

 

import os

import sys

import threading

 

def getfilesize(file):

 file.seek(0, os.seek_end)

 filelength = file.tell()

 file.seek(0, 0)

 return filelength

 

def dividefile():

 filefullpath = r"%s" % raw_input("file path: ").strip("\"")

 dividetotalpartscount = int(raw_input("how many parts do you like to divide?: "))

 if os.path.exists(filefullpath):

  file = open(filefullpath, 'rb')

  filesize = getfilesize(file)

  file.close()

  # send file content

  for i in range(dividetotalpartscount):

   filepartsender = threading.thread(target=seperatefilepart, args=(filefullpath, dividetotalpartscount, i+1, filesize))

   filepartsender.start()

  

  for i in range(dividetotalpartscount):

   sem.acquire()

  os.remove(filefullpath)

 else:

  print "file doesn't exist"

 

def seperatefilepart(filefullpath, dividetotalpartscount, threadindex, filesize):

 try:

  # calculate start position and end position

  filepartsize = filesize / dividetotalpartscount

  startposition = filepartsize * (threadindex - 1)

  #print "thread : %d, startposition: %d" % (threadindex, startposition)

  endposition = filepartsize * threadindex - 1

  if threadindex == dividetotalpartscount:

   endposition = filesize - 1

   filepartsize = filesize - startposition

  file = open(filefullpath, "rb")

  file.seek(startposition)

  filepartname = filefullpath + ".part" + str(threadindex)

  filepart = open(filepartname, "wb")

  lengthwritten = 0

  while lengthwritten < filepartsize:

   buflen = 1024

   lengthleft = filepartsize - lengthwritten

   if lengthleft < 1024:

    buflen = lengthleft

   buf = file.read(buflen)

   filepart.write(buf)

   lengthwritten += len(buf)

  filepart.close()

  file.close()

  sem.release()

  print "part %d finished, size %d" % (threadindex, filepartsize)

 except exception, e:

  print e

 

sem = threading.semaphore(0)

while true:

 dividefile()

文件重组代码：

#-*-encoding:utf-8-*-

import os

def getfilesize(file):

 file.seek(0, os.seek_end)

 filelength = file.tell()

 file.seek(0, 0)

 return filelength

 

def rebuildfile():

 filefullpath = r"%s" % raw_input("file base path: ").strip("\"")

 dividetotalpartscount = int(raw_input("how many parts have you divided?: "))

 file = open(filefullpath, "wb")

 for i in range(dividetotalpartscount):

  filepartname = filefullpath + ".part" + str(i+1)

  filepart = open(filepartname, "rb")

  filepartsize = getfilesize(filepart)

  lengthwritten = 0

  while lengthwritten < filepartsize:

   buflen = 1024

   buf = filepart.read(buflen)

   file.write(buf)

   lengthwritten += len(buf)

  filepart.close()

  os.remove(filepartname)

 file.close()

 

while true:

 rebuildfile()

 

拆分文件演示：

源文件：

拆分：

拆分后文件：

重组文件：

重组后文件：

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