一个Python备份脚本

编写一个Python脚本，实现为重要的文件或文件夹在指定的目录下创建备份。

[设计思路]
[1] 将需要备份的文件和目录由一个列表指定，通过传入参数获得并保存到列表中。
[2] 备份应该保存在主备份目录中。
[3] 将文件备份成一个压缩文件。
[4] 每一次备份都根据当前的日期在主备份目录中创建一个子文件夹，而所备份的文件命名为当期的时间保存在这个子文件夹中。
[5] 压缩命令由本地用户决定。可以使用任何本地的存档压缩命令，只要它有命令行界面就可以了，那样就可以从脚本中传递参数给它。

[参考]
[1] A Byte of Python, 2005
[2] Python Manuals 2.6

[Python Code]
#! /usr/bin/python# Filename: backup_ver1.py# 2010-7-12 wcdjimport osimport timeimport sys# 1, The files and directories to be backed up are specified in a list# source = ['/home/wcdj/my_prog', '/home/wcdj/local_installed']# The following information is the debug usedprint '--------------------------------'source=[]print 'The command line arguments are: 'for i in sys.argv:print iif i == sys.argv[0]:continuesource.append(i)print sourceprint '--------------------------------'# check input, if error app exitif len(source) == 0:print '''You should input the files or directories, likepython backup_ver1.py /home/wcdj/myfile /home/wcdj/mydir ...'''exit()else:print 'Some files or directorier will be saved into .tar.gz format: 'print source# If you are using Windows, use # source=[r'c:/Documents', r'd:/work'] or # source=['c://Documents', 'd://work'] or # something like that# 2, The backup must be stored in a main backup directory# Remember to change this to what you will be usingtarget_dir = '/home/wcdj/backup/'# 3, The files are backed up into a tar file# 4, The name of subdirectory and tar filetoday = target_dir + time.strftime('%Y%m%d')now = time.strftime('%H%M%S')# Take a comment from the user to create the name of the tar filecomment = raw_input('Enter a comment: ')if len(comment) == 0:# check if a comment was enteredtarget = today + os.sep + now + '.tar.gz'else:target = today + os.sep + now + '_' + /comment.replace(' ', '_') + '.tar.gz'#Create the subdirectory if it isn't already thereif not os.path.exists(today):os.mkdir(today)# make directoryprint 'Successfully created directory', today# 5, We use the tar command(in Unix/Linux) to put the files in a tgz archivetar_command = "tar -zcf %s %s" % (target, ' '.join(source))# Run the backupif os.system(tar_command) == 0:print 'Successful backup to', targetelse:print 'Backup failed'# end