Modern Python Standard Library Cookbook

How to do it...

What we want to do is just join all the lists into a single iterable that will yield the items themselves, as we are talking about iterators, the itertools module has the right function that will allow us to chain all the lists as if they were a single one:

>>> import itertools
>>> chained = itertools.chain.from_iterable(values)

The resulting chained iterator will yield the underlying items, one by one, when consumed:

>>> list(chained)
['a', 'b', 'c', 1, 2, 3, 'X', 'Y', 'Z']