Conditional Statement based on value of a different column

Question

I am trying to efficiently add another element to this code below, that takes into account the value of another column in this df.

Below I have a filter if the value column is >= 0, but I want to add an element that says if the column called day = 'Friday', thanks.

df[df['value']] >= 0

Answer 1

use this

df[(df['value']>=0) & (df['day']=='friday') ]