python--用户认证登录实现

# _*_ coding: cp936 _*_  //支持中文格式
import sys 
import getpass
#admin configuration
username='cheeron'
password='1234'
counter = 0 
#认证登录
while True:
    if counter <3: 
        name = raw_input('Please input your name: ').strip()
        if len(name) == 0:
            print 'empty name,try again!'
            continue
        #passwd = raw_input('Please input your password:')
        #使用密码隐藏,getpass函数
        passwd = getpass.getpass('Please input your password')
        if password == passwd and username == name:
            print 'welcome to sign in!%s' % name
        else:
            print 'name or password is not valid，please try again!'
            counter+=1
            continue
        break
    else:
        print 'exceeded 3 times user login...exit the script'
        sys.exit()

　

结果：
[root@cheeron lesson1]# ./qr.py 
Please input your name: 
empty name,try again!
Please input your name: cheeron
Please input your password
welcome to sign in cheeron...

[root@cheeron lesson1]# ./qr.py 
Please input your name: cheeron
Please input your password
name or password is not valid，please try again!
Please input your name: cheeron
Please input your password
name or password is not valid，please try again!
Please input your name: cheeron
Please input your password
name or password is not valid，please try again!
exceeded 3 times user login...exit the script