降价提醒机器人pta

以下是一个降价提醒机器人的示例代码：

def price_alert(target_price, prices):
    for price in prices:
        if price < target_price:
            print("On Sale!", format(price, ".1f"))

target_price = 99
prices = [98.0, 97.0, 100.2, 98.9]

price_alert(target_price, prices)

输出结果为：

On Sale! 98.0
On Sale! 97.0
On Sale! 98.9