省市
dict_1 = {
        ‘湖南‘:{
            ‘长沙‘:[‘岳麓‘,‘天心‘,‘开服‘,‘南站‘],
            ‘株洲‘:[‘荷塘‘,‘河西‘],
        },
        ‘广东‘:{
            ‘广州‘:[‘天河‘,‘白云‘,‘番禺‘],
            ‘深圳‘:[‘保安‘,‘福田‘,‘罗湖‘],
        }
}
isexit = False
while not isexit:
    for i1 in dict_1:
        print(i1)
    u1 = input(‘请输入您想旅游的省：‘)
    if u1 in dict_1:
        while not isexit:
            for i2 in dict_1[u1]:
                print(i2)
            u2 = input(‘请输入您想旅游的市‘)
            if u2 in dict_1[u1]:
                while not isexit:
                    for i3 in dict_1[u1][u2]:
                        print(i3)
                    u3 = input(‘请输入您想旅游的目的地：‘)
                    if u3 in dict_1[u1][u2]:
                        print(‘恭喜你，已经到达目的地‘%s’‘%u3)
                        print(‘请按B退出‘)
                        u4 = input(‘‘)
                        if u4 == ‘B‘ or u4 == ‘b‘:
                            isexit = True
                        elif u4 == ‘c‘ or u4 == ‘C‘:
                            break
            elif u2 == ‘B‘ or u2 == ‘b‘:
                isexit = True
            elif u2 == ‘c‘ or u2 == ‘C‘:
                break
    elif u1 == ‘B‘ or u1 == ‘b‘:
        isexit = True

购物车
shopping = [
            {‘name‘:‘电脑‘,‘price‘:15},
            {‘name‘:‘鼠标‘,‘price‘:100},
            {‘name‘:‘键盘‘,‘price‘:25},
            {‘name‘:‘耳机‘,‘price‘:200},
]

num = 1
shop_car={}
isexit = False
money_1 = input(‘请输入资产：‘)
money = int(money_1)
money_2 = int(money_1)
money_3=[]
for i in shopping:
    print(i[‘name‘],i[‘price‘])

while not isexit:
    inp_1 = input(‘请输入需要购买的商品y退出：‘)
    if inp_1 == ‘y‘:
        print(‘GOBY‘)
        isexit == True
        break
    for i1 in shopping:
        if inp_1 in i1[‘name‘]:
            money -= i1[‘price‘]
            if money < 0:
                while not isexit:
                    print(‘已经透支%s元,请及时充值‘%money)
                    u = input(‘充值金额‘)
                    u1 = int(u)
                    money +=u1
                    money_2 +=u1
                    if money >= 0:
                        print(‘您的可用余额%s‘%money)
                        break
                    else:
                        pass
            m = money_2-money
            money_3.append(m)
            print(‘您购买了%s商品，共消费%s元，可用余额%s元,‘%(num,m,money))
            shop_car[inp_1] = {‘price‘:i1[‘price‘],‘num‘:num}
            num += 1

用户登录
import  random
 
#验证账号
def Sign_Sign(user_name):
    f = open(‘D:\E\semantic/py.txt‘,‘r‘,encoding=‘utf-8‘)
    f.seek(0)
    for i in f:
        i1 = i.strip()
        i2 = i1.partition(‘&‘)
        if user_name == i2[0]:
            return True
    return False
#验证密码
def pwd_pwd(user_pwd):
    f = open(‘D:\E\semantic/py.txt‘,‘r‘,encoding=‘utf-8‘)
    f.seek(0)
    for i in f:
        i1 = i.strip()
        i2 = i1.partition(‘&‘)
        if user_pwd == i2[2]:
            return True
    return False
 
#添加新密码
def modify_pwd(pwd_modify,pwd_r):
    f = open(‘D:\E\semantic/py.txt‘,‘r‘,encoding=‘utf-8‘)
    f.seek(0)
    list_1 = []
    for i in f:
        i1 = i.strip()
        i2 = i1.partition(‘&‘)
        if pwd_modify == i2[0]:
            name = pwd_modify + ‘&‘ + pwd_r + ‘\n‘
            list_1.append(name)
            continue
        list_1.append(i)
    f1 = open(‘D:\E\semantic/py.txt‘,‘a+‘,encoding=‘utf-8‘)
    f1.seek(0)
    f1.truncate()
    for u in list_1:
        f1.write(u)
    f1.flush
 
#验证码
def vcation():
    while True:
        vcation_str = ‘‘
        for i in range(5):
            t = random.randrange(0, 9)
            if t==3 or t==0:
                y = random.randrange(0,9)
                u1 = str(y)
            else:
                j = random.randrange(65,91)
                u1 = chr(j)
            vcation_str += u1
        print (vcation_str)
        vcation_1 = input(‘请输入验证码：‘)
        vcation_2 = vcation_1.upper()
        if vcation_2 == vcation_str:
            return True
        print(‘验证码错误请重新输入：‘)
#主
def Sign():
    inp_1 = input(‘欢迎登录淘宝网，登录请按1，注册请按2.修改密码请按3.\n‘)
    isexit = False
 
    #登录
    if inp_1 == ‘1‘:
        while not isexit:
            user_1 = input(‘请输入登录账号：‘)
            pwd_1 = input(‘请输入登录密码‘)
            vcation()
            r = Sign_Sign(user_1)
            b = pwd_pwd(pwd_1)
            if r and b:
                print(‘登录成功‘)
                break
            else:
                print(‘用户名和密码错误，请重新输入：‘)
 
    #注册
    elif inp_1 == ‘2‘:
        while not isexit:
            user_1 = input(‘请输入注册账号：‘)
            vcation()
            r = Sign_Sign(user_1)
            if r:
                print(‘账号已经存在‘)
                continue
            break
        pwd_1 = input(‘请输入注册密码‘)
        name = ‘\n‘ + user_1 + ‘&‘ + pwd_1
        f = open(‘D:\E\semantic/py.txt‘,‘a+‘,encoding=‘utf-8‘)
        f.write(name)
        f.flush()
        print(‘恭喜注册成功，请刷新登录‘)
        Sign()
 
    #修改密码
    elif inp_1 == ‘3‘:
        while not isexit:
            user_1 = input(‘请输入登录账号：‘)
            pwd_1 = input(‘请输入登录密码‘)
            vcation()
            r = Sign_Sign(user_1)
            b = pwd_pwd(pwd_1)
            if r and b:
                while not isexit:
                    pwd_s = input(‘请输入新密码：‘)
                    pwd_r = input(‘再次输入新密码‘)
                    vcation()
                    print(‘恭喜您已经成功修改密码‘)
                    if pwd_r == pwd_s:
                        modify_pwd(user_1,pwd_r)
                        Sign()
                        return
                    else:
                        print(‘两次密码不一致‘)
            else:
                print(‘用户名和密码错误，请重新输入：‘)
Sign()