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

Here's a oneliner, based on the question you've mentioned:

list(itertools.chain(*((sl if isinstance(sl, list) else [sl]) for sl in l)))

UPDATE: And a fully iterator-based version:

from itertools import imap, chain
list(chain.from_iterable(imap(lambda x: x if isinstance(x, list) else [x], l)))