move column in pandas dataframe
<p>I have the following dataframe:</p>

<pre><code>   a  b   x  y
0  1  2   3 -1
1  2  4   6 -2
2  3  6   9 -3
3  4  8  12 -4
</code></pre>

<p>How can I move columns b and x such that they are the last 2 columns in the dataframe? I would like to specify b and x by name, but not the other columns.</p>