學習了列表和迴圈之後，實現模擬購物車新增商品，退出後列印購物車商品明細

1.建立商品列表

2.輸入工資，選擇購買商品

3.商品大於工資，提示餘額不足，商品小於工資新增購物車並從工資扣減商品金額

4.退出後列印新增購物車內的商品明細

# 購物車程式
goods_list = [["iphone12",900],["mac book",12000]]
buy_list = []
print("歡迎進入商城....")
salary = input("請輸入您的工資：")
salary = int(salary)
break_flak = False
for i in goods_list:
    print
 
(goods_list.index(i) + 1, "商品：" + i[0], "價格：" + str(i[1]) + "元")
while True:
    num = input("請輸入您要購買商品的序號：")
    if num == 'q':
        break_flak = True
        break
    buy_goods = goods_list[int(num)-1]

    goods_name = buy_goods[0]
    goods_money = buy_goods[1]
    if salary  > goods_money :
        salary 
 
=salary - goods_money
        buy_goods_list = [goods_name,goods_money]
        buy_list.append(buy_goods_list)

        print("您選的商品："+goods_name+"已加入購物車，當前餘額:"+str(salary)+"元")
    else:
        print("餘額不足，"+str(salary-goods_money))

if break_flak :
    print("您購買的商品如下：")
    for buy in buy_list :
        
 
print("\t商品："+buy[0]+"，花費:"+str(buy[1])+"元")

    print("您的餘額為："+str(salary))
    print("歡迎下次光臨！")