Python登录验证小程序脚本

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                      Python登录验证小程序脚本
脚本程序流程图:

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#!/usr/bin/env python # _*_ coding:utf-8 _*_ #输入以上一行才可以识别中文字符注释# # ------------------------------------------------------------------------------- # FileName:    login.py # Revision:    1.0 # Date:        2017/09/20 # Author:      XAD # Email:       1793360097@qq.com # Website:     http://onenice.blog.51cto.com/ # Description: check login # Notes:       ~ # ------------------------------------------------------------------------------- # Copyright:   2017(c)XAD # License:     GPL import sys username = 'xad' password = 'xad123' retry_counter = 0 #login_status = 'NO' login_status = 'YES' #用这个来模拟用户是否已在线# # login verification part # while retry_counter <3 : #当retry_counter 大于3次则退出#   user = raw_input('Username:').strip()   if len(user) ==0:   #验证输入用户是否为空，是则继续循环，否则进入下一步验证输入#     print "ERROR : Username cannot be empty!"     continue   passwd = raw_input('Password:').strip()   if len(passwd) == 0:   #验证输入密码是否为空，是则继续循环，否则跳出循环#     print "ERROR : Password cannot be empty!"       continue      else:     if user == username  and  passwd == password:     #验证用户密码是否都正确，都正确才允许登录！#        if login_status == 'YES':           sys.exit('Sorry, user %s has been logining!' % user )        else:           sys.exit('Welcome %s logining to system!' % user )     else:       #retry_counter = retry_counter + 1       retry_counter += 1       print 'Wrong username or password, please verify your username or password ! \nOnly %s more chances!' % (3 - retry_counter  )