Adding new column to existing DataFrame in Python pandas

Question

I have the following indexed DataFrame with named columns and rows not- continuous numbers:

          a         b         c         d
2  0.671399  0.101208 -         


        

Answer 1

If you get the SettingWithCopyWarning, an easy fix is to copy the DataFrame you are trying to add a column to.

df = df.copy()
df['col_name'] = values