This is a quiz that you can apply the pandas skills learned this lesson

your task is to calculate the average price of every building location with transactions since 2015

the output should be sorted by average price from large value to small value

這是一個測驗，您可以應用本課學到的pandas技巧

你的任務是計算自 2015 年以來每個有交易的建築位置的平均價格

輸出應按平均價格從大到小排序