python自动化开发实战实战2：用列表与文件创建购物系统

需求：

一、商家界面

商家可根据自身需求添加和修改商品。并保存到文件中

二、顾客端

1. 顾客登录系统，如果是初次登录，需输入金额；再次登录则不用，直接显示商品清单界面
2. 可保存顾客购买商品信息与价格，下次登录可直接显示

商家代码：

# -*- conding:utf-8 -*-
# Author:OnlyZZQ菜鸟

#商家添加商品界面
#欢迎界面
print("--------欢迎进入店铺商品信息系统----------")
#选择要咨询的操作
while 1:
    print("====请输入商品信息管理编号====")
    c_input = str(input("（1、添加；2、修改价格；q、退出）:"))
    if c_input == "1":
        while 1:
            # 判断是否退出
            # 输入商品名称
            goods_add = input("请输入要添加的商品：")
            if (goods_add == "q" or goods_add == "Q"):
                print("欢迎再次使用")
                exit()
            else:
                isnum = True
                while isnum:
                    # 输入价格
                    goods_pre = input("请输入价格:")
                    if goods_pre.isdigit():
                        goods_pre = str(goods_pre)
                        isnum = False
                    else:
                        print("输入有误，重新输入")
                # 追加列表
                sl = (" ".join([goods_add, goods_pre]))
                goods_list = open("gl.txt", "a")
                goods_list2 = goods_list.write(sl)
                goods_list2 = goods_list.write("\n")
                # goods_list2.close()
                # 显示当期菜单
                print("--------当前有如下商品------")
                goods_list = open("gl.txt", "r")
                goods_list2 = goods_list.read()
                print(goods_list2)
                print("----------------------------")
                goods_list.close()
    elif c_input == "2":
        print("--------当前有如下商品------")
        goods_list = open("gl.txt", "r")
        goods_list2 = goods_list.read()
        print(goods_list2)
        print("----------------------------")
        goods_list.close()
        #将文本里面的信息读取出来，并将列表转为字典
        g_list2 = goods_list2.splitlines()
        #再将列表解出来（使用空格切割出列表）
        gg_list2 = []
        for i in g_list2:
            gg_list2.append(i.split(" "))
        #print(gg_list2)
        #将列表转化为字典
        g_dict = dict(gg_list2)
        #print(g_dict)

        #提示输入要修改的商品价格
        while True:
            c_goods = input("请输入需要修改的商品名称：")
            if (c_goods in g_dict):
                c_price = input("请输入商品价格")
                g_dict[c_goods] = c_price
                print("修改成功！！！")
                #print(g_dict)
                #更新文件
                #清空
                c = open("gl.txt","w")
                c_file = c.write("")
                c.close()
                d = open("gl.txt","a")
                for i in g_dict:
                    c_file = d.write(i)
                    k = str(g_dict[i])
                    c_file =d.write(" ")
                    c_file = d.write(k)
                    c_file =d.write("\n")

                d.close()


            elif (c_goods == "q" or c_goods == "Q"):
                print("欢迎再次使用")
                exit()
            else:
                print("输入有误，请重新输入")

客户端代码：

# -*- conding:utf-8 -*-
# Author:OnlyZZQ
#公众号：OnlyZZQ菜鸟
#列表列出商品信息

'''
shoping_list = [["iphone","5000"],
                [ "ipad", "8000"],
                [ "mac", "12000"],
                [ "xiaomi", "1000"],
                [ "meizu", "2500"],
                [ "huawei", "3000"],
                [ "anycall", "4000"],
                ["oppo", "2600"],]

#将商品列表写如文件中
#将列表转为字符串

for i in shoping_list:
    sl =(" ".join(["8、", "oppo", "2600"]))
goods_list = open("gl.txt","w")
goods_list.write(sl)
goods_list.close()
'''

#储存用户选择列表
goods = []
#储存商品总金额列表
money = []

t_money = 0

#退出函数
'''
def getout():
    continue_shopping = input("是否继续购物（按Q退出购物）")
    if (continue_shopping == "q" or continue_shopping == "Q"):
        for i in money:
            t_money = t_money + int(i)
        print("您选择的商品为{_goods},金额为{_money}.余额为{_salay}".format(goods, str(t_money), salay))
        quit()
        
'''
#从文件中读取商品列表
goods_str = open("gl.txt","r")
shoping_str = goods_str.read()
#print(shoping_str)
goods_str.close()
#将字符串转化为列表
#先按行转成列表
shoping_goods = shoping_str.splitlines()
#print(shoping_goods)
#按空格转换成列表
shoping_list = []
for i in shoping_goods:
    shoping_good = i.split(" ")
    shoping_list.append(shoping_good)
#print(shoping_list)
#存储用户购买记录信息
customer_b = open("cb.txt","r")
customer_buy = customer_b.read()
customer_b.close()
#显示用户购买记录
print(customer_buy)
#判断顾客金额
#先获取用户金额文件
customer_m = open("cm.txt","r")
customer_money = customer_m.read()
customer_m.close()
#判断里面是否有钱，没有的话，提示输入金额
if customer_money == "":
    print("这是空用户，请输入金额")
    is_money = True
    while is_money:
        salay = input("请输入你的余额：")
        if (salay.isdigit()):
            salay = int(salay)
            is_money = False
        else:
            print("您的输入不是余额，请从新输入")
elif int(customer_money) == 0:
    print("这是空用户，请输入金额")
    is_money = True
    while is_money:
        salay = input("请输入你的余额：")
        if (salay.isdigit()):
          salay = int(salay)
          is_money = False
        else:
          print("您的输入不是余额，请从新输入")
else:
    salay = int(customer_money)
    print("您目前账户余额为：", salay)


while 1:
    #通过枚举获取下标
    for index,i in enumerate(shoping_list):
        print(index+1,i)
    #提示用户选择商品
    choose_in = input("请输入你要选择的商品")
    #判断输入是否为数字
    if choose_in.isdigit():
        choose = int(choose_in)
        # 判断商品是否存在
        if ((choose > shoping_list.__len__()) or (choose < 1)):
            print("你选择的商品不存在")
            continue
        # 出现金额不足
        elif (int(shoping_list[choose - 1][1]) > salay):
            print("余额不足,请重新选择或者退出")
            # getout()
            continue
        else:
            print("你已经将%s加入购物车" % shoping_list[choose - 1][0])
            # 剩下余额
            salay = salay - int(shoping_list[choose - 1][1])
            # 显示加入购物车列表
            goods.append(shoping_list[choose - 1][0])
            # 金额
            money.append(shoping_list[choose - 1][1])
            print("你剩下的余额为", salay)
            continue
    #输入Q退出
    elif (choose_in == "q" or choose_in == "Q"):
        for l in money:
            t_money = int(t_money) + int(l)
        print("您选择的商品为", goods, "金额为{_money}.余额为{_salay}".format(_money=t_money, _salay=salay))

        #将用户余额写入文件中
        s_salay = str(salay)
        customer_m = open("cm.txt", "w")
        customer_money = customer_m.write(s_salay)
        customer_m.close()

        #将list转为字符串
        s_goods = " ".join(goods)
        #将购买金额转换为字符串
        tt_money = str(t_money)
        #将商品购买记录追加到文件中
        customer_b = open("cb.txt", "a")
        customer_buy = customer_b.write(s_goods)
        customer_buy = customer_b.write("   总共花费："+tt_money)
        customer_buy = customer_b.write("\n")

        customer_b.close()

        break
    else:
        print("输入有误，请重新输入：")
        continue