how to make list of lists into one list python code example

Example 1: two lists into one list of tules

>>> list_a = [1, 2, 3, 4]
>>> list_b = [5, 6, 7, 8]
>>> list(zip(list_a, list_b))
[(1, 5), (2, 6), (3, 7), (4, 8)]

Example 2: combining list of list to single list python

import itertools
a = [['a','b'], ['c']]
print(list(itertools.chain.from_iterable(a)))