How to add an item at the last nested list of an outer list in python?
<p>Is thery any nice compact way of adding an item to the last nested list of an outer list.
I.e:</p>

<p><code>a=[1,2,[3,4,[5,6]]]</code>
and after the insertion of 7 i want my list to become</p>

<p><code>a=[1,2,[3,4,[5,6,7]]]</code></p>
