#!/usr/bin/env python# -*- coding: utf-8 -*-import os, sysimport filecmpimport reimport shutilholderlist = []##對應第一個步驟def compare_me(dir1, dir2):  dircomp = filecmp.dircmp(dir1, dir2)  only_in_one = dircomp.left_only  diff_in_one = dircomp.diff_files  dirpath = os.path.abspath(dir1)  [ holderlist.append(os.path.abspath(os.path.join(dir1, x))) for x in only_in_one ]  [ holderlist.append(os.path.abspath(os.path.join(dir1, x))) for x in diff_in_one ]  if len(dircomp.common_dirs) > 0:    for item in dircomp.common_dirs:      compare_me(os.path.abspath(os.path.join(dir1, item)), os.path.abspath(os.path.join(dir2, item)))  return holderlist##對應第二個步驟def main():  if len(sys.argv) > 2:    dir1 = sys.argv[1]    dir2 = sys.argv[2]  else:    print "Usage: ", sys.argv[0], "datadir backupdir"    sys.exit()  source_files = compare_me(dir1, dir2)  dir1 = os.path.abspath(dir1)  if not dir2.endswith('/'):    dir2 = dir2 + '/'  dir2 = os.path.abspath(dir2)  destination_files = []  createdir_bool = False  for item in source_files:    destination_dir = re.sub(dir1, dir2, item)    destination_files.append(destination_dir)    if os.path.isdir(item):      if not os.path.exists(destination_dir):        os.makedirs(destination_dir)        createdir_bool = True   ##對應第三個步驟  if createdir_bool:    destination_files = []    source_files = []    source_files = compare_me(dir1, dir2)    for item in source_files:      destination_dir = re.sub(dir1, dir2, item)      destination_files.append(destination_dir)  ##對應第四個步驟  print "update item: "  print source_files  copy_pair = zip(source_files, destination_files)  print "copy_pair is %s" % copy_pair  for item in copy_pair:    print "item is %s, %s" % (item[0], item[1])    if os.path.isfile(item[0]):      shutil.copyfile(item[0], item[1])if __name__ == '__main__':  main()