改进的购物车程序，能实现更完善的功能

用户端：
# -*- coding:utf-8 -*-
shop_line={}
info_user={}
shop_car=[]
import re
for line in open('C:\Users\Administrator.SKY-20140501YNV\Desktop\sshop.txt'):
    line=line.rstrip('\n')
    key=re.split(":",line)
    shop_line[key[0]]=key[1]
for line in open('C:\Users\Administrator.SKY-20140501YNV\Desktop\info.txt'):
    line=line.rstrip('\n')
    key=line.split(":")
    info_user[key[0]]=key[1]
user_name=raw_input("请用户输入用户名》")
if user_name in info_user:
    salary=info_user[user_name]
    salary=int(salary)
else:
    while True:
        salary=raw_input("请输入您的工资:")
        if salary.isdigit():
            salary=int(salary)
            lines=':'.join([user_name,str(salary)])
            open('C:\Users\Administrator.SKY-20140501YNV\Desktop\info.txt','a').write('\n')
            open('C:\Users\Administrator.SKY-20140501YNV\Desktop\info.txt', 'a').write(lines)
            break
while True:
    for i in shop_line:
        print i,shop_line[i]
    chioce=raw_input("请用户输入选择的商品，若想退出，请输入q》")
    if chioce=='q':
        print shop_car,salary
        lines=open('C:\Users\Administrator.SKY-20140501YNV\Desktop\info.txt','r').readlines()
        flen=len(lines)
        for i in range(flen):
            m=re.match(user_name,lines[i])
            if m is not None:
                lines[i]=':'.join([user_name,str(salary)])
                open('C:\Users\Administrator.SKY-20140501YNV\Desktop\info.txt','w').writelines(lines)
        break
    elif chioce in shop_line and salary-int(shop_line[chioce])>=0:
        shop_car.append(chioce)
        salary-=int(shop_line[chioce])
商家端：

# -*- coding:utf-8 -*-
import re
while True:
    shop_line={}
    for line in open('C:\Users\Administrator.SKY-20140501YNV\Desktop\sshop.txt'):
        line=line.rstrip('\n')
        key=re.split(":",line)
        shop_line[key[0]]=key[1]
    print shop_line
    key=raw_input("输入选择改动的商品：")
    chioce=raw_input("如果想删除该商品，则输入d；输入其他继续其他的改动:")
    if chioce=='d':
        del shop_line[key]
    else:
        shop_line[key]=input("输入商品的价格:")
    file=open('C:\Users\Administrator.SKY-20140501YNV\Desktop\sshop.txt','w')
    for key in shop_line:
        lines=':'.join([key,str(shop_line[key])])
        file.write(lines)
        file.write('\n')
    chioce=raw_input("如果没有向改动的商品，输入q离开,否则其他输入继续：")
    file.close()
    if chioce=='q':
        exit()