Joining two pandas dataframes based on multiple conditions

Question

df_a and df_b are two dataframes that looks like following

df_a
A   B       C      D     E
x1  Apple   0.3   0.9    0.6
x1  Orange          


        

Answer 1

You can still achieve this with a left join which is very ideal.
See below:

final_df = pd.merge(df_a, df_b[['A', 'B_new','F']], how="left", left_on=['A', 'B'], right_on=['A', 'B_new']);