老男孩python作业3-购物车程序优化

购物车优化要求：
用户入口：

1.商品信息存在文件里

2.已购商品，余额记录。第一次启动程序时需要记录工资，第二次启动程序时谈出上次余额

3.允许用户根据商品编号购买商品

4.用户选择商品后，检测是否够，够就直接扣款，不够就提醒

5.可随时退出，退出时，打印移购买商品和余额

商家入口：

     1.可以添加商品，修改商品价格1. 运行程序输出第一级菜单

客户端入口程序代码：

import sys
def client_first_login():                  #首次登录函数
    client_salary=input("请输入充值金额:")
    if client_salary.isdigit():
        client_salary=int(client_salary)
        f_client_shopping_record.write(login_name+"\t")           #将购物记录写入文本
        f_client_shopping_record.write(str(client_salary)+"\t")
        f_client_shopping_record.write("no_product" + "\n")
        for i3 in enumerate(product_lists):                     #循环打印列表元素及其索引
            print(i3)
        while True:
            choice=input("请输入英雄皮肤编号,按q退出：")
            if choice.isdigit():
                choice=int(choice)
                if choice>=0 and choice<=len(product_lists):       #输入的数据在产品清单编号范围之内
                    product_price=int(product_lists[choice][1])
                    if client_salary>product_price:
                        shopping_list.append(product_lists[choice])
                        client_salary-=product_price
                        f_client_shopping_record.write(login_name + "\t")       #在client_shopping_record中记录购物信息
                        f_client_shopping_record.write(str(client_salary) + "\t")
                        f_client_shopping_record.write(product_lists[choice][0] + "\n")
                        print("已购买%s,您的余额为%s"%(product_lists[choice][0],client_salary))

                    else:
                        print("对不起您的金额不足，请去充值!")
                        print(shopping_list)
                else:
                    print("请输入合理的产品编号")
            elif choice=="q":
                print(shopping_list)
                sys.exit()

def client_again_login():           #再次登录函数
    client_salary = input("请输入充值金额:")
    if client_salary.isdigit():
        client_salary = int(client_salary)+int(count_cost)
        f_client_shopping_record.write(login_name + "\t")
        f_client_shopping_record.write(str(client_salary) + "\t")
        f_client_shopping_record.write("no_product" + "\n")
        for i3 in enumerate(product_lists):
            print(i3)
        while True:
            choice = input("请输入英雄皮肤编号,按q退出：")
            if choice.isdigit():
                choice = int(choice)
                if choice >= 0 and choice <= len(product_lists):
                    product_price = int(product_lists[choice][1])
                    if client_salary > product_price:
                        shopping_list.append(product_lists[choice])
                        client_salary -= product_price
                        f_client_shopping_record.write(login_name + "\t")
                        f_client_shopping_record.write(str(client_salary) + "\t")
                        f_client_shopping_record.write(product_lists[choice][0] + "\n")
                        print("已购买%s,您的余额为%s" % (product_lists[choice][0], client_salary))

                    else:
                        print("对不起您的金额不足，请去充值!")
                        print(shopping_list)
                else:
                    print("请输入合理的产品编号")
            elif choice == "q":
                print(shopping_list)
                sys.exit()

def product_list():                           #产品清单读取
    f_product_list=open("product_list","r+",encoding="utf-8")
    for i4 in f_product_list:
        product_lists.append(i4.split())

count_client=0
count_cost=0
count_account=0
account_password=''
product_lists=[]
shopping_list=[]
product_list()
login_name=input("请输入英雄联盟账号:")
f_client_shopping_record=open("client_shopping_record","r+",encoding="utf-8")
for i1 in f_client_shopping_record:
    if login_name in i1:
        count_client+=1
        count_cost=i1.split()[1]

f_client_account_message=open("client_account_message","r+",encoding="utf-8")
for i2 in f_client_account_message:
    if login_name in i2:
        count_account+=1
        account_password=i2.split()[1]

if count_client==0:
    if count_account>0:
        while True:
            account_psw=input("请输入密码:")
            if account_password==account_psw:
                print("欢迎%s，登录英雄联盟收银台"%login_name)
                client_first_login()
            else:
                print("密码错误请重新输入密码")
    else:
        print("用户名不存在")
        sys.exit()
else:
    print("欢迎%s,登录英雄联盟收银台,您的余额还剩%s元"%(login_name,count_cost))
    client_again_login()

商家入口程序代码：

f_business=open("product_list","r+",encoding="utf-8")
f_business.write("卡莎"+"\t")
f_business.write(""+"\n")
f_business.flush()              #flush函数作用：将缓冲区中的数据立刻写入文件，同时清空缓冲区
f_business.close()