03-购物车

进程代码：

a.一共3个文件，其中shopping_user.py为进程代码文件，shopping_user.txt为记录用户相关信息文件，shopping_file.py是购物车目录信息文件.

b.把文件放到同一个目录下，然后执行shopping_user.py脚本，进入用户登录界面，按q可以退出程序，按x可以查询以往的消费清单。用户初始登录次数，工资都为0，初始消费记录为空.

#!/usr/bin/env python
# -*- coding: utf-8 -*-
#Author:hejianping
#make at 2017-05-03
import getpass
import shopping_file
userfile = open('shopping_user.txt','r')
userdict = {}
new_userlist = []
shopping_list = []

for line in userfile.readlines():
    userlist = line.strip().split(':')
    _username = userlist[0].strip()
    _passwd = userlist[1].strip()
    _logincount = int(userlist[2].strip())
    _usersalary = int(userlist[3].strip())
    _shoppinglist = userlist[4][:].strip()
    #使用字典函数让每个用户名生成一个对应的列表：
    userdict[_username] = {'name':_username,'pwd':_passwd,'logincount':_logincount,'usersalary':_usersalary,'shoppinglist':_shoppinglist}

while True:
    username = input("please input your username:")
    if username in userdict.keys():
        pass
        password = input("请输入密码：")
        if password == userdict[username]['pwd'].strip():
            if userdict[username]["logincount"] == 0:
                print("33[34;1m Welcome user {name} first login !33[0m".format(name=username))
                salary = input("please input your salary:")
                if salary.isdigit():
                    salary = int(salary)
                else:
                    print("33[34;1m salary invalid option33[0m")
                    continue
                print("33[34;1m your current balance now is {_salary}33[0m".format(_salary=salary))
            else:
                print("33[34;1m Welcome user {name}  login again!33[0m".format(name=username))
                salary = userdict[username]["usersalary"]
                print("33[34;1m your current balance now is {_salary}33[0m".format(_salary=salary))

            #登录购物：
            while True:
                print("33[43;1m ---------Shopping list ---------33[0m")
                for index, value in enumerate(shopping_file.product):
                    print(index, value)
                print("33[43;1m --------------------------------33[0m")
                user_choice = input("What do you want to buy >>>:")
                if user_choice.isdigit():
                    user_choice = int(user_choice)
                    if user_choice < len(shopping_file.product) and user_choice >= 0:
                        price_item = shopping_file.product[user_choice]
                        if price_item[1] <= salary:
                            shopping_list.append(price_item)
                            salary -= price_item[1]
                            print("33[32;1m Added {_price_item} into shopping cart ,your current balance now is {_salary}33[0m".format(_price_item=price_item, _salary=salary))
                        else:
                            print("33[31;1m You had not enough money , your current balance now is {_salary} 33[0m".format(_salary=salary))
                    else:
                        print("33[31;1mproduct code {_user_choice} is not exist!33[0m".format(_user_choice=user_choice))
                        continue
                elif user_choice == "q":
                    userdict[username]['logincount'] += 1
                    userdict[username]['usersalary'] = salary
                    #把shopping_list转换为字符窜 追加到客户的购物清单。
                    userdict[username]['shoppinglist'] += str(shopping_list)
                    userfile = open('shopping_user.txt', 'w+')
                    for change in userdict.values():
                        new_userlist = [str(change['name']), str(change['pwd']), str(change['logincount']),str(change['usersalary']),str(change['shoppinglist'])]
                        colon = ":"
                        new_userlist_colon = colon.join(new_userlist)
                        userfile.write(new_userlist_colon + "
")
                    print("33[43;1m ---------这次购买的商品有： ---------33[0m")
                    for product in shopping_list:
                        print(product)
                    print("33[32;1m current balance:{_salary}33[0m".format(_salary=salary))
                    exit()
                elif user_choice == "x":
                    print("33[43;1m ---------以往购买的商品清单： ---------33[0m")
                    #userdict[username]['shoppinglist'] += str(shopping_list)
                    print("以往消费记录：{list} ，这次消费记录：{nowlist}" .format(list=userdict[username]['shoppinglist'],nowlist=shopping_list))
                else:
                    print("invalid option")
        else:
            print("密码输错！")
    else:
        print("33[31;1m user {user} is not exist!33[0m".format(user=username))

shopping_file.py内容：

#!/usr/bin/env python
# -*- coding: utf-8 -*-
#Author:hejianping
#make at 2017-05-03
product = [
    ("Iphone",3000),
    ("Watch",1000),
    ("Bike",800),
    ("Shoes",500),
    ("Book",100),
]

shopping_user.txt内容：

hecc:333333:0:0:
hebb:222222:0:0:
heaa:111111:0:0:

  内容格式进行说明：

  heaa:111111:0:0:

  用户名：密码：登录次数：工资：消费记录