Fix Python – Python Pandas merge only certain columns

Question

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.

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

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

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

Now we will see solution for issue: Python Pandas merge only certain columns

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')])

This question is answered By – Andy Hayden

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