python基础:购物车的youhua

#关于购物车的优化
#之前写了一个购物车还是存在着bug,打算做个优化
#有两个接口:1.用户接口(购买商品,账户充值)  2.管理员接口(增加或者删除商品,更改商品的价格)
#前提:商品的名称和价格以及金钱的存储都不在内存中，我将其通过txt的文件形式存放在本地目录下,通过文件的读写形式将其调用
#判断是否为新用户,保存余额,如果是老用户,直接根据所剩的余额进入商城




def Main():
    user_balance = ‘balance.txt‘    #根据余额判断是否为新用户(存储用户的余额)
    user_commodity = ‘shopping.txt‘
    while True:
        choice = Interface()
        if choice == ‘1‘:
            is_commodity = True
            commodity_list = []
            new_user(user_balance)
            price = user_price(user_balance)     #获取用户的     钱
            tat = [price,commodity_list]
            commodity(user_commodity,tat)
        elif choice == ‘2‘:
            user_admini = ‘shopping.txt‘
            admini(user_admini)
















#选择接口   1.用户接口  2.管理员接口 [更改商品价格]
def Interface():
    is_choice = True
    while is_choice:
        print(‘1-用户\n2-管理员‘)
        choice = input(‘请选择你的身份:‘)
        if choice == ‘1‘:
            print(‘您将以用户的身份登陆我们的商城!‘)
            is_choice = False
        elif choice == ‘2‘:
            print(‘您将以管理员的身份进入商城!‘)
            is_choice = False
        else:
            print(‘您输入了无效的选项，请重新输入.‘)
    return choice



#判断是否为新用户
def new_user(user_balance):
    try:
        with open(user_balance,mode=‘r‘,encoding=‘utf-8‘) as ff:
            print(‘你目前的账户余额有:‘+ ff.readlines()[0])
    except FileNotFoundError:
        with open(user_balance, mode=‘w‘, encoding=‘utf-8‘) as ff:
            is_number = True
            while is_number:
                number = input(‘您是新用户，请输入您的余额:‘)
                if number.isdigit() == False:
                    print(‘您只能输入数字,请重新输入‘)
                else:
                    print(‘您当前的账户有:‘+ number + ‘余额,请进行购物！‘)
                    ff.write(number)
                    is_number = False


#获取到用户的余额
def user_price(user_balance):
    with open(user_balance,‘r‘) as ff:
        balance = ff.read()
    return balance



#打印商城列表
def commodity(user_commodity,tat):  #tat【钱，已购买商品列表】
    print(‘以下是商城列表中的商品，请根据序号选择!(0:账户充值)‘)
    list_of_commodity = [‘clothes.txt‘, ‘food.txt‘, ‘electronics.txt‘]
    commodity_address = user_commodity
    is_commodity = True
    with open(user_commodity,‘r‘) as ff:
        date_1 = ff.read().splitlines()       #商品列表[衣服，食品，电子]---date_1
    count = 1
    for val in date_1:
        print(str(count) + ‘-‘ + val)
        count = count + 1
    number = input(‘请根据序号选择商品列表(任意键退出):‘)
    while is_commodity:
        if number.isdigit() == False:
            print(‘您已退出商城!‘)
            if len(tat[1]) <= 0:
                print(‘您未购买商品!‘)
                print(‘你的余额还剩:‘+ str(tat[0])+‘\n------------------‘)
            else:
                print(‘您购买了:‘+ str(tat[1]))
                print(‘你的余额还剩:‘+ str(tat[0])+‘\n------------------‘)
            break
        elif number == ‘0‘:
            with open(‘balance.txt‘,‘r‘) as ff:
                    is_recharge = ff.read().splitlines()    #列表[0]
                    is_number = is_recharge[0]
            recharge = input(‘您想充值多少呢:‘)
            if recharge.isdigit() == False:
                print(‘不好意思，您充值的数据有误，请输入数字!‘)
                commodity(user_commodity,tat)
            elif recharge == ‘0‘:
                print(‘不好意思，充值无效!‘)
                commodity(user_commodity,tat)
            else:
                with open(‘balance.txt‘,‘w‘) as f:
                    is_pri = str(int(is_number)+int(recharge))
                    f.write(is_pri)
                    tat[0] = is_pri
                    print(‘恭喜您，充值成功!‘)
            is_commodity = False
            commodity(user_commodity,tat)
        elif int(number) > len(date_1):
            print(‘您所输入的选项不存在!‘)
            is_commodity = False
            commodity(user_commodity,tat)
        else:
            choose = list_of_commodity[int(number)-1]       #存储用户选择列表的文件名
            user_choice(choose,commodity_address,tat)
            break






#用户选择的列表
def user_choice(choice,commodity_address,tat):
    with open(choice,‘r‘) as ff:
        date_2 = ff.read().splitlines()
    is_goods = []   #存储商品
    is_price = []   #存储价格
    count = 1
    is_choice = True
    for val in date_2:
        print(str(count) + ‘-‘ + val)
        a=val.index(‘:‘)
        aa = val[a+1:]
        bb = val[:a]
        is_price.append(int(aa))
        is_goods.append(bb)
        count = count + 1

    print(‘您目前的余额有:‘+ str(tat[0]))
    number = input(‘请输入您需要购买的商品(任意键退出):‘)
    while is_choice:
        if number.isdigit() == False:
            print(‘您已退出当前界面!‘)
            is_choice = False
            commodity(commodity_address,tat)
        elif number == ‘0‘:
            print(‘您所输入的选项不存在!‘)
            is_commodity = False
            user_choice(choice,commodity_address,tat)
        elif int(number) > len(date_2):
            print(‘您所输入的选项不存在!‘)
            is_commodity = False
            user_choice(choice,commodity_address,tat)
        else:
            is_number =input(‘您确定要购买‘+ is_goods[int(number)-1] + ‘这件商品吗?(Y/任意键重新选择)‘)
            if is_number == ‘y‘:
                if int(tat[0]) < is_price[int(number)-1]:
                    print(‘不好意思，您的金钱不足，无法购买!‘)
                    user_choice(choice,commodity_address,tat)
                else:
                    tat[0] = int(tat[0]) - is_price[int(number)-1]
                    with open(‘balance.txt‘,‘w‘) as ff:
                        ff.write(str(tat[0]))
                    tat[1].append(is_goods[int(number)-1])
                    print(‘恭喜您，购买成功!‘)
                    is_choice = False
                    user_choice(choice,commodity_address,tat)
            else:
                user_choice(choice,commodity_address,tat)
            break

#----------管理员接口--------------------

def admini(user_admini):
    list_admini = []
    admini_list = [‘clothes.txt‘,‘food.txt‘,‘electronics.txt‘]
    with open(user_admini,‘r‘) as ff:
       data = ff.read().splitlines()
    count = 1
    for val in data:
        print(str(count)+ ‘-‘ + val)
        count = count + 1
    number = input(‘请输入您要修改的列表(q返回上一级):‘)
    if number == ‘q‘:
        Interface()
    elif number.isdigit() == False:
        print(‘输入错误，请重新输入!‘)
        admini(user_admini)
    elif number == ‘0‘:
        print(‘您输入的选项不存在，请重新输入!‘)
        admini(user_admini)
    elif int(number) > len(data):
        print(‘您输入的选项不存在，请重新输入!‘)
        admini(user_admini)
    else:
        number = int(number) - 1
        operation(number,admini_list[number],user_admini)       #admini_list[number]  地址的存储


#操作列表（增加，修改，删除）
def operation(number,admini_list,user_admini):
    tat = [number,admini_list,user_admini]
    with open(admini_list,‘r‘) as ff:
        list_operation = ff.read().splitlines()
    count = 1
    for val in list_operation:
        print(str(count) + ‘-‘ + val)
        count = count +1
    is_operation = input(‘请选择您的操作[增加-修改-删除](q返回上一级):‘)
    if is_operation==‘q‘:
        admini(user_admini)
    elif is_operation == ‘增加‘:
        increase(admini_list,tat)
    elif is_operation==‘修改‘:
        revise(admini_list,tat)
    elif is_operation == ‘删除‘:
        delete(admini_list,tat)
    else:
        print(‘不好意思，您的操作错误!‘)
        operation(number,admini_list,)


#增加
def increase(admini_list,tat):
    list_increase = []
    is_goods = []   #存储商品
    is_price = []   #存储价格
    is_increase = True
    with open(admini_list,‘r‘) as ff:
        list_increase = ff.read().splitlines()
    for val in list_increase:
        a=val.index(‘:‘)
        aa = val[a+1:]
        bb = val[:a]
        is_price.append(int(aa))
        is_goods.append(bb)
    values = input(‘您添加的商品名称(q返回上一级):‘)
    if values == ‘q‘:
        operation(tat[0],tat[1],tat[2])
    elif values in is_goods:
        print(‘不好意思，商品已经存在!‘)
        increase(admini_list,tat)
    else:
        price = input(‘请输入该商品的价格:‘)
        if price.isdigit() == False:
            print(‘请输入正确的价格!‘)
        else:
            with open(admini_list,‘a‘) as ff:
                ff.write(‘\n‘+values + ‘:‘ + price)
                print(‘添加商品成功‘)
            increase(admini_list,tat)


#修改价格
def revise(admini_list,tat):
    revise_list = []
    with open(admini_list,‘r‘) as ff:
        revise_list = ff.read().splitlines()
    is_goods = []   #存储商品
    is_price = []   #存储价格
    count = 1
    for val in revise_list:
        a=val.index(‘:‘)
        aa = val[a+1:]
        bb = val[:a]
        is_price.append(int(aa))
        is_goods.append(bb)
    for i in range(len(is_goods)):
        print(str(count)+ ‘-‘ + str(is_goods[i]) + ‘:‘ + str(is_price[i]))
        count = count + 1
    is_revise = input(‘请选择你要修改的商品序号(q返回上一级):‘)
    if is_revise == ‘q‘:
        operation(tat[0],tat[1],tat[2])
    elif is_revise.isdigit() == False:
        print(‘不好意思，您输入错误,请重新输入!‘)
        revise(admini_list,tat)
    elif is_revise == ‘0‘:
        print(‘不好意思，该选项不存在，请重新输入!‘)
        revise(admini_list,tat)
    elif int(is_revise) > len(is_goods):
        print(‘不好意思，该选项不存在，请重新输入!‘)
        revise(admini_list,tat)
    else:
        price = input(‘您想修改‘+ str(is_goods[int(is_revise)-1])+‘的价格为:‘)
        if price.isdigit() == False:
            print(‘不好意思，请输入正确的数字!‘)
            revise(admini_list,tat)
        elif price == ‘0‘:
            print(‘不是福利机构啊，白送么!‘)
            revise(admini_list,tat)
        else:
            is_price[int(is_revise)-1] = price
            with open(admini_list,‘w‘) as ff:
                for k in range(len(revise_list)):
                    if k == len(revise_list)-1:
                        ff.write(str(is_goods[k]) + ‘:‘ + str(is_price[k]))
                    else:
                        ff.write(str(is_goods[k]) + ‘:‘ + str(is_price[k])+ ‘\n‘)
            print(‘修改成功!‘)
            revise(admini_list,tat)

#删除
def delete(admini_list,tat):
    delete_list =  []
    with open(admini_list,‘r‘) as ff:
        delete_list = ff.read().splitlines()
    is_goods = []   #存储商品
    is_price = []   #存储价格
    count = 1
    for val in delete_list:
        a=val.index(‘:‘)
        aa = val[a+1:]
        bb = val[:a]
        is_price.append(int(aa))
        is_goods.append(bb)
    for i in range(len(is_goods)):
        print(str(count)+ ‘-‘ + str(is_goods[i]) + ‘:‘ + str(is_price[i]))
        count = count + 1
    is_delete = input(‘请选择你要删除的商品序号(q返回上一级):‘)
    if is_delete == ‘q‘:
        operation(tat[0],tat[1],tat[2])
    elif is_delete.isdigit() == False:
        print(‘不好意思，您输入错误,请重新输入!‘)
        delete(admini_list,tat)
    elif is_delete == ‘0‘:
        print(‘不好意思，该选项不存在，请重新输入!‘)
        delete(admini_list,tat)
    elif int(is_delete) > len(is_goods):
        print(‘不好意思，该选项不存在，请重新输入!‘)
        delete(admini_list,tat)
    else:
        del delete_list[int(is_delete)-1]
        with open(admini_list,‘w‘) as f:
            for i in range(len(delete_list)):
                if i == len(delete_list)-1:
                    f.write(delete_list[i])
                else:
                    f.write(delete_list[i] + ‘\n‘)
        print(‘删除成功!‘)



Main()

python基础:购物车的youhua

原文：https://www.cnblogs.com/ifdashui/p/10645168.html