要求

1、启动程序后让用户输入余额，并打印商品列表
2、用户通过输入编号购买商品
3、用户选择商品购买后，根据余额判断成功或者失败，给出对应提示
4、可以随时退出，退出后打印账号余额以及购买的商品列表

构思

1、首先，用户余额需要进行存储，用户购买的物品需要进行存储在数组中
2、用户购买成功后，将购买的物品放入物品集合，并用总金额减去余额
3、如果失败，给出失败提示，并打印余额
4、用户选择继续后，无论成功失败，都可以继续购买

代码

# 用户输入工资
balance = int(input("Please input balance:"))
# 定义衣服的数组
clothes = [["pants",100],["T-shirt",50],["skirt",20]]
# 个人所得，包括金钱和获取的物品
haveGoods = [balance,[]]
flag = True
while flag:
    # 打印衣服列表
    print("The clothes list is as follows")
    print("______clothesList______")
    i = 1;
    for c in clothes:
        print('The number:',i,":",c)
        i += 1

    # 用户输入商品编号
    code = int(input("Please choose the number:"))
    # 判断钱是否够用
    if clothes[code-1][1] <= haveGoods[0]:
        # 在自己的购物清单中加入已购物品
        haveGoods[1].append(clothes[code-1])
        # 减去花费的金钱
        haveGoods[0] -= clothes[code-1][1]
        print("You have successfully purchased!")
        print("Your account balance is:",haveGoods[0])
    else:
        print("Your account balance is insufficient!")
        print("Your account balance is:",haveGoods[0])
    judge = input("You can press any button to continue,or input 'n' to leave:")
    if judge == "n":
        flag = False
print("Your account balance is:",haveGoods[0])
print("Your shopping list is as follows:")
print("______clothesList______")
for h in  haveGoods[1]:
    print(h)