Python Transform an array
<p>I have this kind of dataframe :</p>

<pre><code>    Variable   Date     Value
0  Variable1  Date1  Valeur 1
1  Variable1  Date2  Valeur 2
2  Variable1  Date3  Valeur 3
3  Variable2  Date4  Valeur 4
4  Variable2  Date5  Valeur 5
</code></pre>

<p>I would like to transform it like this : </p>

<pre><code>    Date Variable1 Variable2
0  Date1  Valeur 1      None
1  Date2  Valeur 2      None
2  Date3  Valeur 3      None
3  Date4      None  Valeur 4
4  Date5      None  Valeur 5
</code></pre>

<p>How can I do this kind of tranformation in Python with panda or numpy?
Thanks for your help</p>