购物车程序，待完善

goods = [
    {‘name‘: ‘电脑‘, ‘price‘: 5999},
    {‘name‘: ‘鼠标‘, ‘price‘: 99},
    {‘name‘: ‘键盘‘, ‘price‘: 299},
    {‘name‘: ‘游艇‘, ‘price‘: 399999},
    {‘name‘: ‘女朋友‘, ‘price‘: 999}
]
from_db_username = ‘jason‘
from_db_password = 123
i = 0
flag = True
while flag:
    while i < 3:
        username = input(‘请输入用户名：‘)
        password = int(input(‘请输入密码：‘))
        if from_db_username == username and from_db_password == password:
            print(‘登录成功‘)
            flag = False
            break
        else:
            i += 1
            print(‘登录失败，您还有%s次机会‘ % (3 - i))
    else:
        answer = input(‘是否继续，是输入y，否输入q：‘)
        if answer == ‘y‘:
            i = 0
        elif answer == ‘q‘:
            break
salary = int(input(‘请输入您的工资：‘))
goods_list = {}
price_list = {}
k = 1
for i in goods:
    goods_list.setdefault(k, i[‘name‘])
    price_list.setdefault(i[‘name‘], i[‘price‘])
    k += 1
print(goods_list)
print(price_list)

goods_num = int(input(‘请输入您要买的商品编号：‘))
if salary > price_list[goods_list[goods_num]]:
    mon_left = price_list[goods_list[goods_num]]
else:
    print(‘余额不足‘)