I have a table like this:
key1 | key2
---------------
0 | a, b, c
---------------
1 | d, e, f
---------------
I would like to convert it to like:
key1 | key2
------------
0 | a
------------
0 | b
------------
0 | c
------------
1 | d
------------
1 | e
------------
1 | f
------------
Any simple way in Pandas? Thanks a lot!