#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：\n")

#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：\n")

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:\n")

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：\n")

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：\n")

index = int(id) - 1

del shop_list[index]

#退出系统函数

def payment():

show_list() #先打印清单

print('\n'*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:\n"+"   添加(a)    修改(e)     删除(d)    结算(p)      超市商品(s)\n")

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()