pandas add columns of 2 dataframes together code example

Example 1: pandas merge two columns from different dataframes

#suppose you have two dataframes df1 and df2, and 
#you need to merge them along the column id
df_merge_col = pd.merge(df1, df2, on='id')

Example 2: sum two columns pandas

sum_column = df["col1"] + df["col2"]