简单的购物车

【项目要求】

1、两个程序，商家的入口和客户的入口；

2、商家的入口要求：

　　（1）可以修改商品的价格，可以下架商品，上架商品，删除商品等操作。

3、客户的入口要求：

　　（1）用户登录时，在本地自己去查找该用户的salary；没有该用户信息则新建改用户信息，让其输入salary；

　　（2）用户购物完毕后打印用户消费的产品并打印salary；

　　（3）用户购物完毕后将用户的salary写进.txt中，在下次登陆时自动调用salary；

【流程图】

【代码】
~1、首先建两个.txt文本，存放商品信息和用户的信息：

commodity_of_merchant.txt          info_of_client.txt

~2、商家入口代码：

# -*- coding:utf-8 -*-
#!/usr/bin/env python
# Author:suchagal

from __future__ import print_function

goods = {}
ss = []
ss1 ={}

f = open(r'commodity_of_merchant.txt','rU')
s = f.readlines()
for i in range(0,len(s)):   #将文本信息转化为字典形式的
    ss = s[i].split()
    ss1 = {ss[0]:ss[1]}
    goods.update(ss1)
print('商品清单'.center(40,'*'))
for i1 in goods:
    print(i1,goods[i1])

while True:
    choice = input('which do you choose? insert/delete/updata/select/quit:')    #提示用户输入选择增/删/改/查
    if choice == 'select':
        for i_sel in goods:
            print(i_sel,goods[i_sel])
    elif choice == 'insert':    #增加商品
        while True:
            ins_good = input('input good which do you want to insert:')
            if ins_good in goods.keys():
                print('the %s has be in the warehouse.'% ins_good)
                continue
            else:
                ins_price = input('input the price of the %s:'% ins_good)
                goods.update({ins_good:ins_price})
                break
    elif choice == 'updata':    #改商品价格
        while True:
            upd_good = input('input good which do you want to change price:')
            if upd_good in goods.keys():
               upd_price = input('input the price of the %s :'%upd_good)
               goods[upd_good] = upd_price
               break
            else:
                print('the %s has not in the warehouse,again' % upd_good)
                continue
    elif choice == 'delete':    #删除商品
        while True:
            del_good = input('input good which do you want to delete price:')
            if del_good in goods.keys():
                goods.pop(del_good)
                break
            else:
                print('the %s has not in the warehouse,again' % del_good)
                continue
    elif choice == 'quit':  #推出程序
        print('商品清单'.center(40,'*'))
        for e in goods:
            print(e,goods[e])
        f1 = open('commodity_of_merchant.txt', 'w') #将信息输出到.txt文本中
        for mer in goods:
            print('{0}	{1}'.format(mer,goods[mer]),file=f1)
        f1.close()
        break
    else:
        print('input error!')
        continue

~3、客户入口代码：

# -*- coding:utf-8 -*-
#!/usr/bin/env python
# Author:suchagal

goods = {}
ss1 = []
sss1 ={}

users_name = {}
ss2 = []
sss2 = {}

shopping_cart = []

f1 = open(r'commodity_of_merchant.txt','rU')
s1 = f1.readlines()
for i in range(0,len(s1)):      #格式化文本，字典类型输出
    ss1 = s1[i].split()
    sss1 = {ss1[0]:ss1[1]}
    goods.update(sss1)
print('商品清单'.center(40,'*'))        #输出commodity_of_merchant.txt的信息
for ii in goods:
    print(ii,goods[ii])

f2 = open(r'info_of_client.txt','rU')
s2 = f2.readlines()
for i1 in range(0,len(s2)):     #格式化文本，字典类型输出
    ss2 = s2[i1].split()
    sss2 = {ss2[0]:ss2[1]}
    users_name.update(sss2)
print('people list'.center(40,'*'))     #输出在info_of_client.txt中的信息
for ii1 in users_name:
    print(ii1,users_name[ii1])

while True:
    user_input = input('input your username:')
    if user_input in users_name.keys(): #判断用户是否存在，若存在打印salary
        print('you have 33[31;1m%s33[0m left' % users_name[user_input])
        salary = int(users_name[user_input])
    else :
        salary = int(input('input your salary:'))   #不存在输入salary
    while True:
        print('商品清单'.center(40, '*'))   #打印商品清单
        for ii in goods:
            print(ii, goods[ii])
        user_choice = input('which one do you like:')
        if user_choice in goods.keys(): #判断用户输入的商品是否在merchant里，若在，则添加到shopping cart并扣费
            shopping_cart.append(user_choice)
            salary = salary - int(goods[user_choice])
            print('purchase success!')
        elif user_choice == 'q':    #‘q’退出并将shopping cart中的货物和余额打印出来，并将余额写入client的info中；
            print('消费清单'.center(40,'*'))
            for sh in shopping_cart:
                print(sh+'
')
            print('you have 33[31;1m%s33[0m left' % salary)
            users_name[user_input]=salary
            f1 = open('info_of_client.txt', 'w')
            for mer in users_name:
                print('{0}	{1}'.format(mer, users_name[mer]), file=f1)
            f1.close()
            break
        else:
            print('the goods your input is none')

来一句励志的英文：

The world is like a mirror: Frown at it and it frowns at you; smile, and it smiles too.