Drop duplicate row, If contain all same value

Question

I have a Dataframe as below:

df = pd.DataFrame({\'first\' : [\'John\', \'Mary\',\'Peter\'],
                      \'last\' : [\'Mary\', \'John\',\'         


        

Answer 1

In [13]: pd.DataFrame(np.sort(df.values, axis=1), columns=df.columns).drop_duplicates()
Out[13]:
  first   last
0  John   Mary
2  Mary  Peter

or:

In [18]: df.values.sort(axis=1)  # NOTE: it sorts DF in-place

In [19]: df
Out[19]:
  first   last
0  John   Mary
1  John   Mary
2  Mary  Peter

In [20]: df.drop_duplicates()
Out[20]:
  first   last
0  John   Mary
2  Mary  Peter