Suppose I have list [['a', 'b', 'c'], ['d', 'e'], ['1', '2']]

I want to generate list where on the first place is any value from first sublist, on the second - from second etc.

So, a couple of examples:

['a', 'd', '1']
['b', 'd', '1']
['c', 'd', '1']
['a', 'e', '1']
['a', 'e', '2']
['b', 'e', '1']
['b', 'e', '2']

etc.

You need itertools.product() which return cartesian product of inpur iterables:

>>> from itertools import product
>>> my_list = [['a', 'b', 'c'], ['d', 'e'], ['1', '2']]#                v Unwraps the list
>>> list(product(*my_list))
[('a', 'd', '1'), ('a', 'd', '2'), ('a', 'e', '1'), ('a', 'e', '2'), ('b', 'd', '1'), ('b', 'd', '2'), ('b', 'e', '1'), ('b', 'e', '2'), ('c', 'd', '1'), ('c', 'd', '2'), ('c', 'e', '1'), ('c', 'e', '2')]