python学习第二天练习

#作业二：请闭眼写出购物车程序

#需求:
用户名和密码存放于文件中，格式为：egon|egon123
启动程序后，先登录，登录成功则让用户输入工资,然后打印商品列表，失败则重新登录，超过三次则退出程序
允许用户根据商品编号购买商品
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
可随时退出，退出时，打印已购买商品和余额

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Site    : 
# @File    : 第二天作业.py
# @Software: PyCharm
# @Author  : XFJ
# @Time    : 2018/12/4 23:28

import  sys,os
msg_dic={
'apple':10,
'tesla':100000,
'mac':3000,
'lenovo':30000,
'chicken':10,
}
with open('E:\\user.txt','w',encoding='utf-8') as f :
    f.write('egon|egon123\n')
f.close()
with open('E:\\user.txt','r',encoding='utf-8') as f1:
    l=f1.readline().rstrip('\n').split('|')
print(l,type(l))
tag=True
count=0
count1=0
sum=0
balance=0
goods=[]

while tag:
    user=input('please input your name >>: ')
    user=user.strip()
    if len(user)==0 or user!= l[0]:
        continue
    else:
        while tag:
            password=input('please input your password>>: ')
            password=password.strip()
            if len(password)==0 or password!=l[1]:
                count+=1
                if count==3:
                    tag=False
                    print('密码输入错误三次，请稍后重试！')
                    break
                continue
            else:
                while tag:
                    salary=input('please input you money>>:   ')
                    salary=salary.strip()
                    if len(salary)==0 or salary.isdigit() is False:
                        continue
                    else:
                        salary = int(salary)
                    print(salary)

                    for key in msg_dic:
                        print('Name: {name} Price: {price}'.format(name=key,price=msg_dic[key]))
                    while tag:
                        choice =input ('please input your choice>>: ').strip()
                        if  len(choice)==0 or choice not in msg_dic:
                            print('请输入正确的商品名称！')
                            continue
                        print('Name: {name} Price: {price}'.format(name=choice, price=msg_dic[choice]))

                        while True:
                            num1 = input('please input how much do you want>>: ').strip()
                            if  len(num1)==0 or num1.isdigit() is False:
                                print('请输入正确商品个数！')
                                continue
                            count1+=1
                            num1=int(num1)
                            # print(num1,type(num1))
                            good1={count1:[choice,msg_dic[choice],num1]}
                            goods.append(good1)
                            sum+=msg_dic[choice]*num1
                            # print(sum)
                            if salary>=sum :
                                balance=salary-sum
                                print(goods)
                                print(balance)
                                break
                            else:
                                goods.pop()
                                print(goods)
                                print(balance)
                                print('余额不足，请充值')
                                a=input('是否继续购买？继续请输入：Y/y,退出请输入：N/n\n').strip()
                                if len(a)==0 or a not in ['Y','y','N','n']:
                                    continue
                                elif a in ['N','n']:
                                    print(goods,balance)
                                    tag=False
                                    break
                                else:
                                    break