python学习之课后习题

编写一个动态备份文件的python脚本：

#!/usr/bin/python #filename :backup_ver2.py import os import time import sys source=[] for i in sys.argv: print i source.append(i) #source=['/root/python/test.py','/root/python/backup_var1.py'] print source del(source[0]) print '#######' print source target_dir='/root/python/' today=target_dir+time.strftime('%Y%m%d') now=time.strftime('%H%M%S') if not os.path.exists(today): os.mkdir(today) print 'successfully created directory', today target=today+os.sep+now+'.zip' zip_command="zip -qr '%s' %s" %(target,' '.join(source)) #run the backup if os.system(zip_command)==0: print 'successfully backup to the target',target else: print 'failed backup' 这里利用list的可增可减的特性，进过反复的实验，发现使用sys.argv的方法后会把本身的py脚本也包裹到里面如下：

[root@fsailing1 python]# python backup_ver2.py /root/python/test.py /root/python/while.py backup_ver2.py /root/python/test.py /root/python/while.py ['backup_ver2.py', '/root/python/test.py', '/root/python/while.py'] successfully backup to the target /root/python/20120627/203320.zip 所以使用了del的方法进行删除了，这样就会好点儿了。

[root@fsailing1 python]# python backup_ver2.py /root/python/test.py /root/python/while.py backup_ver2.py /root/python/test.py /root/python/while.py ['backup_ver2.py', '/root/python/test.py', '/root/python/while.py'] ####### ['/root/python/test.py', '/root/python/while.py'] successfully backup to the target /root/python/20120627/203634.zip