Python 编写登录接口

思路一：

 

# coding:utf-8
"""
登录接口：
-输入用户名和密码
-认证成功后显示欢迎信息
-输错三次后锁定
"""
import sys,os

i = 0
while i < 3:
    name = raw_input('请输入用户名：')
    with open('D:/account_lock.txt','r+') as f:
        lock_list = f.readlines()
        for lock_user in lock_list:
            lock_user = lock_user.strip('\n')
            if name == lock_user:
                sys.exit('用户 %s 已被锁定' % name)
        with open('D:/account.txt','r') as f2:
            user_list = f2.readlines()
            for user in user_list:
                (user,password) = user.strip('\n').split()
                if name == user:
                    j = 0
                    while j < 3:
                        pwd = raw_input('请输入密码：')
                        if pwd == password:
                            sys.exit('用户 %s 登录成功' % name)
                        else:
                            if j != 2:
                                print '密码错误，还有 %d 次机会请重新输入！' % (2 - j)
                                j +=1        
                            else:
                                f.write(name + '\n')
                                sys.exit('密码错误，用户 %s 达到最大登录次数，将被锁定并退出' % name)         
                else:
                    pass
            else:
                if i != 2:
                    print '用户 %s 不存在，还有 %d 次机会请重新输入' % (name,(2 - i))
                    i +=1
                else:
                    f.write(name + '\n') 
                    sys.exit('用户 %s 不存在且达到最大登录次数，将被锁定并退出' % name)

 

 

 

思路二：

 

# coding:utf-8
"""
登录接口：
-输入用户名和密码
-认证成功后显示欢迎信息
-输错三次后锁定
"""
import sys

i = 0
account_file = 'account.txt'
lock_file = 'account_lock.txt'

while i < 3:
    username = raw_input('Please input username:')
    lock_check = file(lock_file)
    for line in lock_check.readlines():
        if username == line.strip():
            sys.exit('User %s has been locked!' % username)

    password = raw_input('Please input password:')
    with open(account_file,'rb') as f:
        match_flag = False
        for line in f.readlines():
            user,pwd = line.strip().split()
            if username == user and password == pwd:
                print username,'Match successful!'
                match_flag = True
                break
    if match_flag == False:
        print 'Username or password is wrong!'
        i += 1
    else:
        print 'Welcome login doujiao system!'
        break
else:
    print 'User %s has been locked!' % username
    with open(lock_file,'rb+') as f:
        f.write(username + '\n')