Pandas: Transform dataframe to show if a combination of values exists in the orignal Dataframe

Question

I have a Dataframe that looks like this:

 | Col 1 | Col 2 | 
0|   A   |   2   |
1|   A   |   3   |
2|   B   |   1   |
3|   B   |   2   |

an

Answer 1

You could use:

df.groupby(['Col 1','Col 2']).size().unstack(fill_value=0).astype(bool)

Col2      1     2      3
Col1                    
A     False  True   True
B      True  True  False