文章标题

题目1：用户管理系统V2：

用户功能如下:

welcome to xxxx system

1.注册:若用户存在，直接报错”name 已经存在”,若用户不存在，将用户信息保存起来，显示”注册成功”;

2.登陆:若用户存在，判断密码是否正确,若用户不存在，报错”name 不存在”;

3.注销：若用户存在，删除用户信息；若不存在，报错报错”name 不存在；

4.退出:break

#!/usr/bin/env python
#coding=utf-8
d={"root":"westos"}
def ZhuCe():
for i in d.keys():
ZhuCe_User = raw_input("please input Zhuce username:")
ZhuCe_PassWd=raw_input("please input zhuce password:")
if ZhuCe_User==i:
print "用户已经存在!"
if ZhuCe_User!=i:
d.setdefault(ZhuCe_User,ZhuCe_PassWd)
print "创建成功"
break
def DengLu():
for i in range(1, 4):
check_UserName = raw_input("please input your username:")
check_PassWord = raw_input("please input your passwd  :")
if check_UserName in d.keys() and check_PassWord in d.values():
print ("login ok")
break
elif check_UserName not in d.keys():
print ("user is not exist")
elif check_PassWord not in d.values():
print ("password is no ok")
print "count is bigger than 3"
def ZhuXiao():
ShanChu_user=raw_input("please input ShanChu username:")
if ShanChu_user not in d.keys():
print "user is not exist"
else:
d.pop(ShanChu_user)
print "删除成功"
while 1:
pro='''                    welcome to Linux system
1.注册(Z)
2.登陆(D)
3.注销(A)
4.退出(Q)
please input your choice:'''
choice=raw_input(pro).upper()
if choice in "Zz":
ZhuCe()
elif choice in "Dd":
DengLu()
elif choice in "Aa":
ZhuXiao()
elif choice in "Qq":
break
else:
print "input your choice:"