购物程序

# -*- coding: utf-8 -*-
"""
Created on Tue Sep 11 16:35:29 2018

@author: 车路历程
"""
goods = [
{"name": "电脑", "price": 1999},
{"name": "鼠标", "price": 10},
{"name": "游艇", "price": 20},
{"name": "美女", "price": 998},
]
'''
1、启动程序后，输入用户名密码后，让用户输入工资，然后打印商品列表
2、允许用户根据商品编号购买商品
3、用户选择商品后，检测余额是否够，够就直接扣款，不够就提醒
4、可随时退出，退出时，打印已购买商品和余额
5、在用户使用过程中， 关键输出，如余额，商品已加入购物车等消息，需高亮显示
扩展需求：
1、用户下一次登录后，输入用户名密码，直接回到上次的状态，即上次消费的余额什么的还是那些，再次登录可继续购买
2、允许查询之前的消费记录
'''
# 用户名为；lilu   密码为：123
# 创建的文件名称为：purchase_records.txt
# 按 q键 表示退出
import re
import os

# 在当前目录下自动创建一个空文件purchase_records.txt
desktop_path = os.getcwd()
full_path = desktop_path + '\' + 'purchase_records' + '.txt'
file = open(full_path, 'a+')
file.write('')
file.close()

name = input('请输入用户名：').strip()
key = input('请输入密码：').strip()

if key.isdigit():
    if name == 'lilu' and key == '123':
        print('您上次的选购状态为：')
        with open('purchase_records.txt', 'r') as f:
            print(f.read())
        with open('purchase_records.txt', 'r') as f:
            last_time_record_list = [i for i in f.readlines()]
            
        if len(last_time_record_list) != 0:
            salary = re.search("[0-9]+", last_time_record_list[-1]).group()
            purchase_list = re.search("[[].+[]]", last_time_record_list[-2]).group()[1:-1]
                            .replace("'",'').replace(' ', '').split(",")
        else:
            purchase_list = []
            salary = input('请输入您的工资:').strip()
            
        if salary.isdigit():
            salary = int(salary)
            while True:
                print([(i[0], i[1]['name']) for i in enumerate(goods)])
                choice = input('请根据商品编号，选择您需要的商品:').strip()
                if choice.isdigit() and 0 <= int(choice) < len(goods):
                    choice = int(choice)
                    if salary >= goods[choice]["price"]:
                        purchase_list.append(goods[choice]["name"])
                        print('33[1;31;40m%s33[0m已加入购物车' %goods[choice]["name"])
                        with open('purchase_records.txt', 'a') as f:
                            left_salary = salary - goods[choice]["price"]
                            f.write('salary:'+str(salary)+'---'+goods[choice]["name"]
                                     +'---'+'left_salary:'+str(left_salary)+'
')             
                        salary -= goods[choice]["price"]
                        print('余额为：33[1;31;40m%s33[0m' %salary)
                    else:
                        print('33[1;35;40m您的余额不足，请充值33[0m')
                elif choice == 'q':
                    print('您选择的商品为：%s'%purchase_list)
                    with open('purchase_records.txt', 'a') as f:
                        f.write('购买记录：%s
'%purchase_list)
                        f.write('账户余额：%s
'%salary)
                    break
                else:
                    print('您输入的内容有误，请重新输入')             
        else:
            print('请您输入数字')
    else:
        print('您输入的用户名和密码有误，请重新输入')
else:
    print('请输入数字密码')