products = [['phone1',100],['phone2',200],['phone3',300],['phone4',500],['phone5',500],['phone6',1800]]
shopping_cart = []
run_flag = True  # 标志位
while run_flag:
    wage = input("请输入您的工资,退出请输入q|Q:")
    if wage.isdigit():
        wage = int(wage)
        while run_flag:
            print("--------商品列表-------")
            for index,p in enumerate(products):
                print("%s: %s %s" %(index,p[0],p[1]))
            choice = input("请输入您购买的商品：")
            if choice.isdigit():
                choice = int(choice)
                if choice >= 0 and choice < len(products):
                    if wage > products[choice][1]:
                        shopping_cart.append(products[choice])
                        print("Added product %s into shopping cart. " % (products[choice]))
                        wage -= products[choice][1]
                        print(wage)
                    else:
                        print("您的余额不足")
                else:
                    print("商品不存在")
            elif choice == 'q':
                if len(shopping_cart) > 0:
                    print("---------您购买的产品为-----------")
                    for index, p in enumerate(shopping_cart):
                        print("%s.  %s  %s" % (index, p[0], p[1]))

                print('您的余额为：',wage)
                #break
                run_flag = False
            else:
                print("请输入数字")

    elif wage == 'q' or wage == 'Q':
        run_flag = False
    else:
        print('工资必须是数字')