python文件拆分与重组实例

Python  /  管理员 发布于 7年前   199

文件拆分代码：

#-*-encoding:utf-8-*- import osimport sysimport 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 osdef 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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