join与
on='i'
d.join(d.drop('i', 1), on='i', rsuffix='_y') some_col i some_col_y0 A 2 C1 B 1 B2 C 1 B
join与
on='i'
d.join(d.drop('i', 1), on='i', rsuffix='_y') some_col i some_col_y0 A 2 C1 B 1 B2 C 1 B