Python实现定期检查源目录与备份目录的差异并进行备份功能示例

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import os, sys
import filecmp
import re
import shutil
holderlist = []
##对应第一个步骤
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
##对应第二个步骤
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
   ##对应第三个步骤
  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)
  ##对应第四个步骤
  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()