Python:在列表的列上合并两个Pandas数据框

问题描述：

我需要基于一列名为作者"的列表来找到两个熊猫数据框之间的交集.>在此处输入图片描述

I need to find intersection between two pandas dataframes based on a column of lists named "authors".enter image description here

但是我得到了这个错误在此处输入图片描述

but instead i get this error enter image description here

答

您无法在列表上合并，因为列表无法散列，请参见

You cannot merge on a list, because list cannot be hashed, see this. One option would be to create an additional column by converting list to string and merge on it, e.g.:

df['authors_as_string'] = df['authors'].apply(lambda x: "-".join(x))

这将产生:

   id    authors authors_as_string
0   1  [a, b, c]          a-b-c
1   2  [a, b, c]          a-b-c
2   3     [a, b]            a-b
3   4     [a, c]            a-c

然后，您可以在第三列上进行合并.

Then you can merge on that third column.

或者，您可以尝试在该问题中发布的其他解决方案.

Alternatively you can try other solutions posted in that question.

Python:在列表的列上合并两个Pandas数据框

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