As an FYI, nosferatu-man's and my solutions are better than S. Carton's, but require Python 2.4. The "key" parameter to sort/sorted does a "Decorate-Sort-Undecorate"[1] automatically, whereas the ...

So to create a nested list array, you can do that with lists of lists or object numpy arrays with arrays as elements. We could expand this support to multi-dimensional numpy arrays. I am not sure we ...