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!
 
    