用户管理系统

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:"