I have a dataframe that looks like this:
mAID MAID PIDs
0 A D [YY, ZZ]
1 B E [XY]
2 A E [YY, XX]
3 A F [YY, XX, ZZ]
I want to convert it to such:
mAID MAID PIDs
A D YY
A D ZZ
B E XY
A E YY
A E XX
A F YY
A F XX
A F ZZ
Thank you.