控制台超市系统(Python)

#定义仓库
repos = dict()

#定义购物清单对象
shop_list = []

#定义函数来初始化商品
def init_repository():
    goods1 = ("1001","鼠标",45)
    goods2 = ("1002","键盘",78)
    goods3 = ("1003","毛笔字帖",21.5)
    goods4 = ("1004","算法竞赛",89)
    goods5 = ("1005","声律启蒙",35)
    goods6 = ("1006","Python爬虫",118)

#把商品放入dict中(入库),条码作为key

    repos[goods1[0]] = goods1
    repos[goods2[0]] = goods2
    repos[goods3[0]] = goods3
    repos[goods4[0]] = goods4
    repos[goods5[0]] = goods5
    repos[goods6[0]] = goods6

#定义函数,显示超市商品清单,即遍历字典dict
def show_goods():
    print('欢迎光临独狼超市')
    print('超市的商品清单为：')
    print("%13s%30s%12s" % ("条码","商品名称","单价"))
    #遍历repos中所有value来显示商品清单
    for goods in repos.values():
        print("%15s%30s%12s" % goods)

#定义函数,显示购物清单（遍历shop_list列表）
def show_list():
    print("="*100)
    #如果清单不为空，则输出清单的内容
    if not shop_list:
        print("还未购买商品")
    else:
        title = "%-5s | %15s | %30s | %10s | %4s | %10s" % ("ID","条码","商品名称","单价","数量","小计")
        print(title)
        print("-"*100)

        #记录总计的价钱
        sum = 0
        #遍历购物清单shop_list
        for i,item in enumerate(shop_list):
            id = i + 1 #转换id为索引加1
            code = item[0] #获取商品条码
            name = repos[code][1] #获取商品名称
            price = repos[code][2] #获取商品单价
            number = item[1] #获取商品数量

            amount = price * number #小计
            sum = sum + amount #总计

            line = "%-5s | %17s | %30s | %12s | %6s | %12s "% (id,code,name,price,number,amount)
            print(line)
        print("-"*100)
        print("                                 总计：",sum)
    print("="*100)

#定义函数,添加购买的商品（向shop_list中添加项）
def add():
    code = input("请输入商品的条码： ")

    #若没有找到对应的商品,则输出条目错误
    if code not in repos:
        print("条码错误,请重新输入!")
        return

    goods = repos[code] #根据条码找商品
    number = input("请输入购买的数量： ")

    shop_list.append([code,int(number)]) #把商品和购买数量封装成list后加入到购物清单中

#定义函数,修改购买商品的数量
def edit():
    id = input("请输入要修改的购物单的ID: ")
    index = int(id)-1 #id减1得到购物单的索引
    item = shop_list[index] #根据索引获取购物清单
    number = input("请输入新的购买数量： ")
    item[1] = number #修改item里面的number

#定义函数,删除购物清单项
def delete():
    id = input("请输入要删除的购物清单的ID： ")
    index = int(id) - 1
    del shop_list[index]

#退出系统函数
def payment():
    show_list() #先打印清单
    print(' '*3)
    print("欢迎下次光临")
    import os
    os._exit(0)

cmd_dict = {'a':add,'e':edit,'d':delete,'p':payment,'s':show_goods}

#定义函数,显示命令提示
def show_command():
    cmd = input("请输入操作指令: "+"   添加(a)    修改(e)     删除(d)    结算(p)      超市商品(s) ")
    if cmd not in cmd_dict:
        print("输入有误,请重新输入")
    else:
        cmd_dict[cmd]()

init_repository()
show_goods()
while True:
    show_list()
    show_command()