I have the following dataframe:
fsq digits digits_type
0 1 1 odd
1 2 1 odd
2 3 1 odd
3 11 2 even
4 22 2 even
5 101 3 odd
6 111 3 odd
and I want to add a last column, count, containing the number of fsq belonging to the digits group, i.e:
fsq digits digits_type count
0 1 1 odd 3
1 2 1 odd 3
2 3 1 odd 3
3 11 2 even 2
4 22 2 even 2
5 101 3 odd 2
6 111 3 odd 2
Since there are 3 fsq rows that has digits equal to 1, 2 fsq rows that has digits equal to 2, etc.