注册购买商品加充值

# _*_coding:utf-8_*_
# Author:egon

'''
dbfile 格式为 

egon,egon123,100
len,123,0
wxx,123,0
lxx,123,100
cls,123,361
'''

import os

product_list = [['Iphone7',5800],
                ['Coffee',30],
                ['疙瘩汤',10],
                ['Python Book',99],
                ['Bike',199],
                ['ViVo X9',2499],

                ]

shopping_cart={}
current_userinfo=[]

db_file=r'dbfile.txt'

while True:
    print('''
1 登陆
2 注册
3 购物
    ''')

    choice=input('>>: ').strip()

    if choice == '1':
        #1、登陆
        tag=True
        count=0
        while tag:
            if count == 3:
                print('\033[45m尝试次数过多，退出。。。\033[0m')
                break
            uname = input('用户名：').strip()
            pwd = input('密码：').strip()

            with open('dbfile', 'r', encoding='utf-8') as f:
                for line in f:
                    line=line.strip('\n')
                    user_info=line.split(',')
                    #print(user_info)
                    uname_of_db=user_info[0]
                    pwd_of_db=user_info[1]
                    balance_of_db=int(user_info[2])

                    if uname == uname_of_db and pwd == pwd_of_db:
                        print('\033[48m登陆成功\033[0m')

                        # 登陆成功则将用户名和余额添加到列表
                        current_userinfo=[uname_of_db,balance_of_db]
                        print('用户信息为：',current_userinfo)
                        tag=False
                        break
                else:
                    print('\033[47m用户名或密码错误\033[0m')
                    count+=1

    elif choice == '2':
        uname=input('请输入用户名：').strip()
        while True:
            pwd1=input('请输入密码：').strip()
            pwd2=input('再次确认密码：').strip()
            if pwd2 == pwd1:
                break
            else:
                print('\033[39m两次输入密码不一致，请重新输入！！!\033[0m')

        balance=input('请输入充值金额：').strip()

        with open('dbfile','a',encoding='utf-8') as f:
            f.write('%s,%s,%s\n' %(uname,pwd1,balance))

    elif choice == '3':
        if len(current_userinfo) == 0:
            print('\033[49m请先登陆...\033[0m')
        else:
            #登陆成功后，开始购物
            uname_of_db=current_userinfo[0]
            balance_of_db=current_userinfo[1]

            print('尊敬的用户[%s] 您的余额为[%s],祝您购物愉快' %(
                uname_of_db,
                balance_of_db
            ))

            tag=True
            while tag:
                for index,product in enumerate(product_list):
                    print(index,product)
                choice=input('输入商品编号购物，输入q退出>>: ').strip()
                if choice.isdigit():
                    choice=int(choice)
                    if choice < 0 or choice >= len(product_list):continue

                    pname=product_list[choice][0]
                    pprice=product_list[choice][1]
                    if balance_of_db > pprice:
                        if pname in shopping_cart: # 原来已经购买过
                            shopping_cart[pname]['count']+=1
                        else:
                            shopping_cart[pname]={'pprice':pprice,'count':1}

                        balance_of_db-=pprice # 扣钱
                        current_userinfo[1]=balance_of_db # 更新用户余额
                        print("Added product " + pname + " into shopping cart,\033[42;1myour current\033[0m balance " + str(balance_of_db))

                    else:
                        print("买不起，穷逼! 产品价格是{price},你还差{lack_price}".format(
                            price=pprice,
                            lack_price=(pprice - balance_of_db)
                        ))
                    print(shopping_cart)
                elif choice == 'q':
                    print("""
                    ---------------------------------已购买商品列表---------------------------------
                    id          商品                   数量             单价               总价
                    """)

                    total_cost=0
                    for i,key in enumerate(shopping_cart):
                        print('%22s%18s%18s%18s%18s' %(
                            i,
                            key,
                            shopping_cart[key]['count'],
                            shopping_cart[key]['pprice'],
                            shopping_cart[key]['pprice'] * shopping_cart[key]['count']
                        ))
                        total_cost+=shopping_cart[key]['pprice'] * shopping_cart[key]['count']

                    print("""
                    您的总花费为: %s
                    您的余额为: %s
                    ---------------------------------end---------------------------------
                    """ %(total_cost,balance_of_db))

                    while tag:
                        inp=input('确认购买(yes/no?)>>: ').strip()
                        if inp not in ['Y','N','y','n','yes','no']:continue
                        if inp in ['Y','y','yes']:
                            # 将余额写入文件

                            #src_file='db_file'
                            dst_file=r'%s.swap' %db_file
                            with open('dbfile','r',encoding='utf-8') as read_f,\
                                open(dst_file,'w',encoding='utf-8') as write_f:
                                for line in read_f:
                                    if line.startswith(uname_of_db):
                                        l=line.strip('\n').split(',')
                                        l[-1]=str(balance_of_db)
                                        line=','.join(l)+'\n'

                                    write_f.write(line)
                            os.remove('dbfile')
                            os.rename(dst_file,'dbfile')

                            print('购买成功，请耐心等待发货')

                        shopping_cart={}
                        current_userinfo=[]
                        tag=False


                else:
                    print('输入非法')


    else:
        print('\033[33m非法操作\033[0m')