python处理LINUX的PWD文档

用冒号分隔的哟。

此章后面讲的JSON，配置文件读取，原理应该一样吧，只是要用合适的包去处理吧。

CSV文档是用CSV包处理的。

文档：

root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/bin/sh
bin:x:2:2:bin:/bin:/bin/sh
sys:x:3:3:sys:/dev:/bin/sh
sync:x:4:65534:sync:/bin:/bin/sync
games:x:5:60:games:/usr/games:/bin/sh
man:x:6:12:man:/var/cache/man:/bin/sh
lp:x:7:7:lp:/var/spool/lpd:/bin/sh
mail:x:8:8:mail:/var/mail:/bin/sh
news:x:9:9:news:/var/spool/news:/bin/sh
uucp:x:10:10:uucp:/var/spool/uucp:/bin/sh
proxy:x:13:13:proxy:/bin:/bin/sh
www-data:x:33:33:www-data:/var/www:/bin/sh
backup:x:34:34:backup:/var/backups:/bin/sh

代码：

import csv
import sys
from optparse import OptionParser

if __name__ == '__main__':
    parser = OptionParser()
    parser.add_option('-f', '--file', help="CSV Data File")
    opts, args = parser.parse_args()
    if not opts.file:
        parser.error('File name not exist.')
    #Create a dict reader from an open file
        #handle and iterate through rows.
    csv.register_dialect('passwd', delimiter=':',quoting=csv.QUOTE_NONE)
    dict_key = ('login','pwd','uid','gid','comment','home','shell')
    reader = csv.DictReader(open(opts.file,'rU'),fieldnames=dict_key,dialect='passwd')
    for user in reader:
        print ('%s logs in with %s' % \
               (user['login'], user['shell']))
    csv.register_dialect

截图：