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：

来源：https://blog.csdn.net/qwertyupoiuytr/article/details/66616934