python week2 购物车优化

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用户入口
1. 商品信息存在文件里
2. 已购商品，余额记录

商家入口
3. 可以添加商品，修改商品价格
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filePath = ‘goodslist.txt‘
with open(filePath, ‘r‘) as f:
    filetext=f.read()
filetextlines=filetext.split(‘\n‘) # 每行一个元素,不含换行符
# 提取商品列表
goods = list([])
for k in range(len(filetextlines)):
    c=filetextlines[k].split()
    goods.append([c[0],int(c[1])])
    
goodsLen = len(goods)
# 用户入口
salary=int(input("请输入您的工资： "))
balance = salary
print(‘编号‘,‘商品名称 ‘,‘价格‘)
for k in range(goodsLen):
    print(k,‘. ‘,goods[k][0],‘  ‘,goods[k][1])

orderList = list([])
while True:
    selectNum = int(input("请选择商品编号(-1退出)："))
    if selectNum  0:
        break
    tempBalance = balance-goods[selectNum][1]
    if tempBalance  0:
        print(‘余额不足‘)
    else:
        orderList.append(goods[selectNum])
        balance=tempBalance
print("您的购物清单：")
for k in range(len(orderList)):
    print(orderList[k]) 
print("您的余额为：%d"%(balance))

# 商家入口
goodskey = list(dict(goods).keys())
print(‘编号‘,‘商品名称 ‘,‘价格‘)
for k in range(goodsLen):
    print(k,‘. ‘,goods[k][0],‘  ‘,goods[k][1])
while True:
    updateInfo = (input("请选择更新商品(q退出，商品名：修改价格)："))
    print(updateInfo)
    if updateInfo==‘q‘:
        break
    else:
        try:
            ind = goodskey.index(updateInfo)
            goods[ind][1]=int(input(‘请输入价格: ‘))
        except:
            goods.append([updateInfo,int(input(‘请输入价格:‘))])    

goodsstr = ‘‘
for k in range(len(goods)):
    goodsstr += goods[k][0] +‘\t‘+str(goods[k][1])+‘\n‘
with open(filePath, ‘w‘) as f:
    f.write(goodsstr)