windows平台下实现《简明python教程》第10章的文件备份示例四

 参考一《简明python教程》：http://old.sebug.net/paper/python/index.html

1，《简明python教程》第10章的文件备份示例四中，需要用到zip命令，而windows下是没有，下载了7z-zip代替，同时将7z路径添加到环境变量中。因此文件拷贝命令需要根据7z.exe命令行参数作相应修改；

    

#1. the file and directories to be backed up are specified in a list.
#source = r'C:\Users\YU\Documents\NotePad++'
source = r'C:\Users\YU\Documents\NotePad++\*'

#2.The backup must be stored in a main backup directory
target_dir = 'G:\\Yu\\NppBackup\\'

#5.We use the zip command to put the files in a zip archive
zip_command = "7z a -tzip %s %s" % (target,source)

 2，windows下python表示文件路径的两种方式

    在上面代码中有两种表述文件路径的方式：a.用自然字符串表示，在字符串前加‘r'，不使用转义字符，如source文件路径；b.使用转义字符，如target_dir文件路径

3，python使用mkdir函数出现错误 WindowsError:[Error 3]

    参考二：python使用mkdir函数出现错误WindowsError:[Error 3]的解决办法

    原因是’mkdir‘只能创建单层文件夹，如果创建嵌套文件夹则需要使用’makedirs‘

4，完整代码

#!/usr/bin/python
# _*_ coding: utf-8 _*_

import os
import time

#1. the file and directories to be backed up are specified in a list.
#source = r'C:\Users\YU\Documents\NotePad++'
source = r'C:\Users\YU\Documents\NotePad++\*'

#2.The backup must be stored in a main backup directory
target_dir = 'G:\\Yu\\NppBackup\\'

#3.the files are backed up into a zip file
#4.the current day is the name of the subdirectory in the main directory
today = target_dir + time.strftime('%Y%m%d')
#the current time is the name of the zip archive
now = time.strftime('%H%M%S')
target = today + os.sep + now + '.zip'

#Create the subdirectory if it isn't already there
if not os.path.exists(today):
	#os.mkdir(today) #make single level directory
	os.makedirs(today) #make multiple levels directory
	print 'Successfully created directory',today

#5.We use the zip command to put the files in a zip archive
zip_command = "7z a -tzip %s %s" % (target,source)

#run the backup
if os.system(zip_command) == 0:
	print 'Successful backup to',target
else:
	print 'Backup Failed'

#End of file

运行结果：