python练习2 购物车程序

#  -*-   coding: utf-8   -*-
# @Time      : 2018/10/18 16:06
# @Author    : Two Brother
# @EMAIL     : yeluyide@163.com
# @FILE      : shoppingcart.py
# @SOFTWARE  : PyCharm

##################title#####################
#用户入口：
#1.商品信息存在文件里
##
#商家入口：
#2.可以添加商品，修改商品价格
############################################
with open('use','r+',encoding='utf-8') as fu:
    dictfu = {}
    lines1 = fu.readlines()
    for line in lines1:
        (key,value) = line.strip().split()
        dictfu[key] = value
with open('commodity', 'r+', encoding='utf-8') as fc:
    dictfc = {}
    lines2 = fc.readlines()
    for line in lines2:
        (key,value1,value2) = line.strip().split()
        dictfc[key] = {value1:value2}
with open('admin','r') as fa:
    admin = fa.readlines()
    for i in range(0,len(admin)):
        admin[i] = admin[i].strip()
i = input("请输入您的账号>>>>>>>>>>")
if i in dictfu.keys():
    lastmoney = int(dictfu[i])
    print('我是会员%s，我的余额%s' % (i,lastmoney))
    for n in dictfc:
        print(n,dictfc[n])
    buy = []
    salecost = 0
    while True:
        ic = input("请输入您要购买的商品编号>>>>>>>")
        if ic in dictfc.keys():
            print("商品%s已经加入购物车,查看购物车请按S,直接支付请按P" % dictfc[ic])
            buy.append(dictfc[ic])
            for x in dictfc[ic]:
                salecost = salecost + int(dictfc[ic][x])
            continue
        elif ic.upper() == 'S':
            print("您的购物车信息如下,总计%s元，直接支付请按P" % salecost)
            for y in buy:print(y)
            continue
        elif ic.upper() == 'P':
            if salecost <= lastmoney:
                lastmoney2 = lastmoney - salecost
                print("您本次消费金额%s元，余额还剩余%s元！欢迎下次光临" % (salecost,lastmoney2))
                with open('use', 'w', encoding='utf-8') as fu2:
                    for line in lines1:
                        if i in line:
                            line = line.replace(str(lastmoney),str(lastmoney2))
                        fu2.write(line)
                break
            else:
                pi = input("您本次购物需要花费金额%s元，余额只有%s元，交易失败，重新购物请按B，充值请按R，退出请按其他键>>>>"%(salecost,lastmoney))
                if pi.upper() == 'B':
                    continue
                if pi.upper() == 'R':
                    print("充值功能待开放")
                    break
                else:
                    break
        else:
            break

elif i in admin:
    while True:
        ai = input("请选择你要做的操作：A查看商品 B修改商品价格 C添加删除商品>>>>>")
        if ai.upper() == 'A':
            for o in dictfc:
                print(o,dictfc[o])
                continue
        elif ai.upper() == 'B':
            bi = input("请选择你要修改商品的商品编号>>>>")
            if bi in dictfc:
                print(dictfc[bi])
                bi2 = input("请输入你要修改此商品的价格>>>>")
                with open('commodity','w',encoding='utf-8') as fc2:
                    for line in lines2:
                        if bi in line:
                            for bi3 in dictfc[bi]:
                                line = line.replace(dictfc[bi][bi3],bi2)
                        fc2.write(line)
                with open('commodity', 'r', encoding='utf-8') as fc3:
                    lines3 = fc3.readlines()
                    for line in lines3:
                        (key, value1, value2) = line.strip().split()
                        dictfc[key] = {value1: value2}
            else:
                print("商品编码输入有误，请重新输入")
                continue
        else:
            print('程序退出')
            break
else:
    print('用户不存在')