row wise sorting in pandas dataframe and aggregation

Question

I have a table in pandas dataframe df

col1    col2     count
12       15        3
13       17        5
1        36        4
15       12        7
36       1               


        

Answer 1

Sort your rows, then group and sum:

df[['a', 'b']] = df[['a', 'b']].apply(sorted, axis=1)
df.groupby(['a', 'b'], as_index=False)['c'].sum()