Correct way to set new column in pandas DataFrame to avoid SettingWithCopyWarning

Question

Trying to create a new column in the netc df but i get the warning

netc[\"DeltaAMPP\"] = netc.LOAD_AM - netc.VPP12_AM

C:\\Anaconda\\lib\\site-packages\\ipykerne         


        

Answer 1

You need to reset_index when you will create column especially if you have filtered on specific values... then you don't need to use .loc[row_indexer,col_indexer]

netc.reset_index(drop=True, inplace=True)
netc["DeltaAMPP"] = netc.LOAD_AM - netc.VPP12_AM

Then it should work :)