Python making list of lists from list : <p>My code now: <code>random_lst = [1,2,3,4,5,6,7,8,9]</code></p>

<p>What's practical way in Python to make list of lists from list?</p>

<p>My goal: <code>[[1,2,3],[4,5,6],[7,8,9]]</code></p>
