Use the unique() function to return a new Series object with only the the unique or distinct values in the Series.
>>> df = DataFrame.from_query('select admitted from admissions_train') >>> s = df.squeeze(axis = 1) >>> s 0 1 1 1 2 0 3 0 4 1 5 0 6 1 7 0 8 0 9 1 Name: admitted, dtype: object
>>> s.unique() 0 0 1 1 Name: admitted, dtype: object