Comparing 2 columns of two Python Pandas dataframes and getting the common rows

Question

I have 2 Dataframe as follows:

DF1=
    A    B   C    D
0   AA   BA  KK   0
1   AD   BD  LL   0
2   AF   BF  MM   0

DF2=
    K    L
0   AA   BA
1   AD   BF
         


        

Answer 1

DF1.merge(right=DF2,left_on=[DF1.A,DF1.B],right_on=[DF2.K,DF2.L], indicator=True, how='left')

gives:

A B C D K L _merge 0 AA BA KK 0 AA BA both 1 AD BD LL 0 NaN NaN left_only 2 AF BF MM 0 AF BF both

So, as above, indicator does the job.

Peter