python combine 2 list together code example

Example 1: how to combine two lists in python

listone = [1,2,3]
listtwo = [4,5,6]

joinedlist = listone + listtwo

Example 2: combining list of list to single list python

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