Python - order list of lists by multiple column indexes
<p>Let's say I've the following list x in Python</p>

<pre><code>[['a',6,'aa']
['d',7,'bb']]
['c',1,'cc']
['a',4,'dd']
['d',2,'ee']]
</code></pre>

<p>and I want to sort its elements in order to obtain the following result</p>

<pre><code>[['a',4,'dd']
['a',6,'aa']
['c',1,'cc']
['d',2,'ee']
['d',7,'bb']]
</code></pre>

<p>that is I want to sort it by two columns, the first one (the most important) and the second one (the less important). This is probably a duplicate question but I haven't been able to find the solution...</p>