How to do Match Merge either in Python or in Python Pandas

Question

How to do Match Merge in Python or Python Pandas ( Like match Merge in SAS)

Data set A Dataset B
S.No X Y X Y
1 12 6 12 5
2 5 8 5 10
3 11 11 12
4 12 7 12 9
5 5 5 5

Result A Matching Col. is S.NO
S.No X Y
1 12 6
2 5 8
3 11 12
4 12 7
5 5 5

Answer 1

can you please make your data set clear?

Answer 2

If i understand your question correctly I would make the datasets into lists and compare them in an If statement.
Here is an example:
https://code.sololearn.com/cfSleqMvCVAv/?ref=app

[EDIT] I'm not sure how you are merging the two sets, but it shouldn't be hard to add it to your 'equals' list.