为什么此输出列表在此代码中不起作用？

Question

I am trying to use an output within another line of code as a list. I want to find the product code where the ordernumber equals the following values:

ordnumber = [10334, 10401, 10407, 10414]

The input:

(orderdetails_df.productcode).where(orderdetails_df.ordernumber == ordnumber)

I get back the error:

ValueError: Lengths must match to compare

Answer 1

我会这样：

orderdetails_df.loc[orderdetails_df.ordernumber.isin(ordnumber), productcode]