combine all sets in list python code example

Example 1: how to combine two lists in python

l1 = ["a", "b" , "c"]
l2 = [1, 2, 3]
l1 + l2
>>> ['a', 'b', 'c', 1, 2, 3]

Example 2: python concatenate list of lists

x = [["a","b"], ["c"]]

result = sum(x, [])