Python实现自动更改系统用户密码，生成随机密码

算是一个实用的例子，定制系统任务，并将随机密码上传至日志服务器，实现定期修改密码；

部分代码：

 1 #!/usr/bin/env python
 2 #coding:utf-8
 3 import random,string,os,pexpect,time,re
 4 def passwd_Create():                                #生成随机密码
 5     all_choice = string.ascii_letters+string.digits
 6     passwd = ''
 7     for i in range(8):
 8         passwd += random.choice(all_choice)
 9     return passwd
10
11 def passwd_Change(name,pwd):                         #更改密码
12     child = pexpect.spawn('passwd '+name)
13     index = child.expect(['New password',pexpect.EOF,pexpect.TIMEOUT])
14     if index == 0 :
15         child.sendline(pwd)
16         time.sleep(2)
17         child.sendline(pwd)
18         time.sleep(2)
19         child.close(force=True)
20     else:
21         print "expect ERROR"
22         child.close(force=True)
23
24 def log_Note(name,key):                          #记录日志
25     with open('/var/log/passwd','a+') as log:
26         counts = time.ctime()+" ["+name+"]"+" password is"+" ["+key+"]"+"\n"
27         log.write(counts)
28
29 def checkPw(passwd):                              #检测密码的强度
30     plen = len(passwd)
31     print plen
32     chpw1 = re.compile(r'.*[A-Z]+.*')
33     chpw2 = re.compile(r'.*[a-z]+.*')
34     chpw3 = re.compile(r'.*\d{1,}.*')
35     chresult1 = chpw1.findall(passwd)
36     print "匹配大写字符: ",chresult1
37     chresult2 = chpw2.findall(passwd)
38     print "小写字符: ",chresult2
39     chresult3 = chpw3.findall(passwd)
40     print "至少一个数字: ",chresult3
41
42     if chresult1 and chresult2 and chresult3:
43         print "You will change passwd use this password"
44         return 0
45     else:
46         print "password is not safety,will generate a safety passwd"
47         return 1
48
49 users = ['root','tom','alice']           #系统用户列表
50
51 if __name__ == "__main__":
52     for i in range(len(users)):
53         a = 1
54         while a != 0 :
55             keys = passwd_Create()
56             a = checkPw(keys)
57         passwd_Change(users[i],keys)
58         log_Note(users[i],keys)