1

I have a dataframe like this:

x,y,z 1,2,3 2,3,4 1,6,7

And I have a column like this:

a 4 5

Column a should be added when x = 1. So it should look like this:

x, y, z, a 1 2 3 4 2 3 4 NaN 1 6 7 5

How would I do this using pandas

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1 Answer 1

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3

Assign pandas object index will be one of the hidden key , so we should do assign by value only

df.loc[df['x'] == 1, 'a'] = col['a'].values
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