Concatenate distinct columns in two dataframes using pandas (and append similar columns)

Question

My question is closely related to Pandas Merge - How to avoid duplicating columns but not identical.

I want to concatenate the columns that are diff

Answer 1

You can use nested merge

merge_on = ['id','place','name','qty','unit']
df1.merge(df2, on = merge_on).merge(df3, on = merge_on)



    id  place   name    qty unit    A   B   C   D
0   1   NY      Tom     2   10      a   b   c   d
1   2   TK      Ron     3   15      a   b   c   d
2   3   Lon     Don     5   90      a   b   c   d
3   4   Hk      Sam     4   49      a   b   c   d