Say I have a DataFrame that looks something like this:
A B key1 key2
0 A0 B0 K0 K0
1 A1 B1 K0 K1
2 A2 B2 K1 K0
3 A3 B3 K2 K1
4 A0 B0 K0 K0
I know that I can get the counts of unique values in the 'key1' column with this: df['key1'].value_counts() which returns something like this:
K0 3
K1 1
K2 1
But what if I want to get counts of combinations between the two key columns. To return something like this:
K0 K0 2
K0 K1 1
K0 K1 1
K0 K1 1
