How to flatten a hetrogenous list of list into a single list in python?

Question

I have a list of objects where objects can be lists or scalars. I want an flattened list with only scalars. Eg:

L = [35,53,[525,6743],64,63,[743,754,757]]
ou         


        

Answer 1

it could be done neatly in one line using numpy

import numpy as np
np.hstack(l)

you end up with an ndarray

array([  35,   53,  525, 6743,   64,   63,  743,  754,  757])