ValueError: Length of values does not match length of index | Pandas DataFrame.unique() : <p>I am trying to get a new dataset, or change the value of the current dataset columns to their unique values. 
Here is an example of what I am trying to get : </p>

<pre><code>   A B
 -----
0| 1 1
1| 2 5
2| 1 5
3| 7 9
4| 7 9
5| 8 9

Wanted Result    Not Wanted Result
       A B            A B
     -----          -----
    0| 1 1         0| 1 1
    1| 2 5         1| 2 5
    2| 7 9         2| 
    3| 8           3| 7 9
                   4|
                   5| 8
</code></pre>

<p>I don't really care about the index but it seems to be the problem. 
My code so far is pretty simple, I tried 2 approaches, 1 with a new dataFrame and one without. </p>

<pre><code>#With New DataFrame
 def UniqueResults(dataframe):
    df = pd.DataFrame()
    for col in dataframe:
        S=pd.Series(dataframe[col].unique())
        df[col]=S.values
    return df

#Without new DataFrame
def UniqueResults(dataframe):
    for col in dataframe:
        dataframe[col]=dataframe[col].unique()
    return dataframe
</code></pre>

<p>I have the error "Length of Values does not match length of index" both times.</p>
