Make new column in Panda dataframe by adding values from other columns

Question

I have a dataframe with values like

A B

1 4

2 6

3 9

I need to add a new column by adding values from column A and B, like

A B C

1 4 5

2 6 8

3 9 12

I believe this can be done using lambda function, but I can't figure out how to do it.

Answer 1

The answer for this is very simple:

df['C'] = df['A'] + df['B']