Python Pandas仅合并某些列 [英] Python Pandas merge only certain columns

问题描述

是否可以仅合并某些列?我有一个DataFrame df1，其中包含x，y，z和df2列，其中x，a，b，c，d，e，f等.

Is it possible to only merge some columns? I have a DataFrame df1 with columns x, y, z, and df2 with columns x, a ,b, c, d, e, f, etc.

我想合并x上的两个DataFrame，但是我只想合并df2.a，df2.b列-而不是整个DataFrame.

I want to merge the two DataFrames on x, but I only want to merge columns df2.a, df2.b - not the entire DataFrame.

结果将是具有x，y，z，a，b的DataFrame.

The result would be a DataFrame with x, y, z, a, b.

我可以合并然后删除不需要的列，但是似乎有更好的方法.

I could merge then delete the unwanted columns, but it seems like there is a better method.

推荐答案

您可以合并sub-DataFrame(仅包含这些列):

You could merge the sub-DataFrame (with just those columns):

df2[list('xab')]  # df2 but only with columns x, a, and b

df1.merge(df2[list('xab')])

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