how to combine two lists in python

1x = [["a","b"], ["c"]]
2
3result = sum(x, [])
4# This combines the lists within the list into a single list

1list1 = ["a", "b" , "c"]
2list2 = [1, 2, 3]
3
4list1.extend(list2)
5print(list1)
6

1listone = [1,2,3]
2listtwo = [4,5,6]
3mergedlist = []
4mergedlist.extend(listone)
5mergedlist.extend(listtwo)

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

1first_list = ["1", "2"]
2second_list = ["3", "4"]
3
4# Multiple ways to do this:
5first_list += second_list
6first_list = first_list + second_list
7first_list.extend(second_list)
8

1x = [["a","b"], ["c"]]
2
3result = sum(x, [])