what is the most efficient way to turn a list in python
<p>so I have this list in python,</p>

<pre><code>a=  [[1,2,3,4],
     [2,4,5,1],
     [3,4,6,2],
     [2,3,4,5]]
</code></pre>

<p>and want to turn the list reading horizontally to vertically.</p>

<pre><code>b=    [[1,2,3,2],
       [2,4,4,3],
       [3,5,6,4],
       [4,1,2,5]]
</code></pre>

<p>what is the best way to do it, and most efficient way to do it? i'm pretty new to programming, sorry for being noob. thanks.</p>
