python写购物车小程序

python写的购物车小程序，可以实现的功能：显示商品价格，输入选中的商品序号，将可以购买的商品加入购物车并显示余额。当购买商品价格高于余额时提示不能购买。代码如下：
#_author:"WangBin"
#date:2018/4/23
msg = '''
-------------Information of commodity-------------
1.iphone8  5800
2.mac book 9000
3.coffee   32
4.python book 80
5.bicyle     1500
-------------------ending-------------------------
'''
print(msg)
loop_falg = True   #循环标志位，当为True时执行循环
total_monnye = 5000
get_commodity = []
while loop_falg:
    num = input('Choose your commodity number:')
    num_int = int(num)
    commodity_name = ['iphone8','mac book','coffee','python book','bicyle']
    commodity_price = ['5800','9000','32','80','1500']
    for i in range(6):
        if i == num_int:
            monney_left = total_monnye - int(commodity_price[num_int - 1])
            total_monnye = monney_left
            if monney_left >= 0:
                print("已将商品" + commodity_name[num_int - 1] + "加入购物车，"
                                                             "当前剩余金额为：" + str(monney_left))
            else:
                print("当前余额不足，请选择其它商品，当前余额为：", monney_left)
    else:
        get_commodity.append(commodity_name[num_int - 1])
        get_commodity.append(commodity_price[num_int - 1])
        conti_find = input('是否继续购物？y/n:') #判断是否继续购物
        if conti_find =='n':
            loop_falg = False
            print("您已购买下列商品：",get_commodity)
            print("您的余额为："+str(monney_left)+"元， 欢迎下次光临")