Get All Unique Values in a Row

Question

I have a DataFrame df1 that looks like this:

A       B       C
-----------------
1       1       2
2       2       3
5       4       9
         


        

Answer 1

In [88]: df.stack().groupby(level=0).apply(lambda x: x.unique().tolist())
Out[88]:
0       [1, 2]
1       [2, 3]
2    [5, 4, 9]
dtype: object