〖Demo〗-- 购物车

【购物车】

 

1. 商品信息- 数量、单价、名称
2. 用户信息- 帐号、密码、余额
3. 用户可充值
4. 购物历史信息
5. 允许用户多次购买，每次可购买多件
6. 余额不足时进行提醒
7. 用户退出时 ，输出档次购物信息
8. 用户下次登陆时可查看购物历史
9. 商品列表分级显示

# 用户登录
T = True
name = input('Please enter name:')
f = open('shopping.txt','r')
gg = f.read()
f.close()
ff = gg.split()
count = 0
for cc in ff: # 检查是否新用户
    bb = cc.split(',') # 分成不同列表
    if bb[0] == name:
        qq = bb[2]
        while T:
            password = input('Please enter password:')
            if password == qq:
                balance = bb[1]
                print ('Welome! Your balance is %s' % balance)
                count=+1
                break
            else:
                print('Your password was wrong.')
        break
    else:
        continue
if count == 0:
    password = input('Please enter password:')
    print('Welcome to the first! Your balance is 0')
    balance = 0

# 创造三级菜单
shoppingmall = {'sport': {'clothes':{'coat':{20: 80}, 'shirt':  {30: 100}, 'skirt': {20: 120}},
                            'tools': {'net': {20: 70}, 'bat': {40: 100}, 'fish pole': {20: 90}},
                            'ball': {'basketball': {90: 200}, 'pingpong': {10: 20}, 'football': {50: 170}}},
                'electrical equipment': {'phone': {'Apple': {10: 6000}, 'Xiaomi': {15: 2000}, 'Huawei': {5: 3000}},
                          'computer': {'HP': {2: 4000}, 'Lenovo': {6: 2200}, 'Dell': {10: 3000}},
                          'TV': {'Sony': {60: 5000}, 'LG': {30: 3000}, 'TCL': {40: 2200}}},
                'book': {'baby': {'Story': {50: 37},'Picture': {30: 64},'Music': {60: 93}},
                          'child': {'Exercise': {30: 36},'Earth': {20: 55},'Weather': {30: 64}},
                          'adult': {'Leaning': {40: 45},'Cookbook': {50: 74},'Tourism': {50: 43}}}}
list1=[]
list2=[]
list3=[]
shopping_list=[]
item_price={}
lse = []

# 打印一级菜单
while T:

    while T:
        for key in shoppingmall:
            print(key)
            list1.append(key)
# 选择一项到下一级菜单或者退出
        choose = input('Please choose thing or q = quit:')
        if choose == 'q':
            exit('Bye!')
# 进入下一级菜单
        elif choose in list1:
            a = shoppingmall.get(choose)
            while T:
                for key1 in a:
                    print(key1)
                    list2.append(key1)
            # 选择一项到下一级菜单或者退出或返回

                choose1 = input('Please chose that you want or q = quit or b = back:')
                if choose1 == 'q':
                    exit('Bye!')
                elif choose1 == 'b':
                    break
                elif choose1 in list2:
                # 进入下一级菜单
                    b = a.get(choose1)
                    while T:
                        for key2 in b:
                            c = b.get(key2)
                            list3.append(key2)
                            for number in c:
                                price = c.get(number) #number剩余数量，price 商品价钱
                                item_price[key2] = price#商品和对应的价钱放入字典中
                                print ('%s is $%s left %s' % (key2, item_price[key2], number))
# 选择退出，返回上一级菜单 或者第一个菜单
                        choose2 = input('What do you want to buy? n = quit，b = back.')
                        if choose2 == 'n':
                            exit('Bye!')
                        elif choose2 == 'b':
                            break
                        elif choose2 in list3:
                            quantity = int(input('Please choose quantity'))
                            if quantity <=number: #检查购买数量是否大于存货量
                                if choose2 in shopping_list:
                                    local = shopping_list.index(choose2)
                                    quantity = int(quantity) + int(shopping_list[local+2])
                                    goods_price = (quantity * item_price[choose2])
                                    shopping_list.pop(local+1)
                                    shopping_list.pop(local+1)
                                    shopping_list.insert(local+1, goods_price)
                                    shopping_list.insert(local+2, quantity) #物品数量放入购物名单中
                                else:
                                    shopping_list.append(choose2)
                                    goods_price = (quantity * item_price[choose2])
                                    shopping_list.append(goods_price)
                                    shopping_list.append(quantity) # 物品数量放入购物名单中
                                shop_thing = shopping_list[::3]
                                shop_num = shopping_list[2::3]
                                print('Shopping list has:')
                                ii = len(shop_thing)
                                for item in range(ii): # 输出购买名单
                                    print ('%s has %s'% (shop_thing[item], shop_num[item]))
                                last = input('Goods have been put in shopping_list, what do you want to do? '
                                    'c = check out, q = quit, o = other thing I want to buy.')
                                if last == 'c':
                                    #计算总数
                                    total_price = 0
                                    for h in range(len(shop_thing)):
                                        total_price += goods_price
                                    print('Total price is %s, your balance is %s' % (total_price, balance))
                                    while T:
                                        if total_price> int(balance): # 检查余额是否足够
                                            out = input('Balance is not enough,do you want to rechange? y =yes,'
                                                        'q = quit')
                                            if out == 'y':
                                                recharge = input('How much do you recharge') # 余额不足，需要充值
                                                if int(recharge) and int(recharge)>0:
                                                    balance = int(balance) + int(recharge)
                                                else:
                                                    one_more = input('Invalid value, any key = please again, q = quit.')
                                                    if one_more == 'q':
                                                        exit()
                                            elif out == 'q':
                                                exit()
                                        else:
                                            balance = int(balance) - total_price # 计算总价，余额，输出购买清单
                                            shopping_list[-1] = balance
                                            print ('This you shopping list'.center(40,'*'))
                                            aa = len(shop_thing)
                                            for item1 in range(aa):
                                                print ('%s: %s'% (shop_thing[item1], shop_num[item1]))
                                            print ('Total price is %s, balance is %s' % (total_price, balance))
                                            end = 'Thank you, please come again'.center(40, '*')
                                            print (end)
                                            if count == 0: # 购买的历史信息写入文件
                                                f = open('shopping.txt', 'a') #这次购买物品放入文本中
                                                msg = '\n%s,%s,%s\n' % (name, balance, password)
                                                f.write(msg)
                                                f.close()
                                                exit()
                                            else:
                                                for cc in ff:
                                                    bb = cc.split(',') # 分成不同列表
                                                    dd = type(bb)
                                                    if bb[0] == name:
                                                        bb[1] = str(balance)
                                                    ee = ','.join(bb).strip()
                                                    lse.append(ee)
                                                    ss = '\n'.join(lse)

                                                f = open('shopping.txt', 'w') #这次购买物品放入文本中
                                                f.write(ss)
                                                f.close()
                                            exit()
                                elif last == 'q':
                                    exit()
                                elif last == 'o':
                                    continue
                                else:
                                    print ('Yout choose is over the choose, please choose again')
                            else:
                                print ('Quantity is over, please choose again')
                        else:
                            print ('Yout choose is over the choose, please choose again')
                else:
                    print('Sorry, your choose not in list! Please choose again')
        else:
             print('Sorry, your choose not in list! Please choose again')