There are couple of efficient ways to merge / join / concatenate multiple lists in Python programming. They have their own advantages. Let’s see how to use them with example.
Using + operator
One of the commonly used practice to concatenate two lists is to use the + operator. Using this method, you can even join more than two lists at the same time. The + operator add the elements of multiple lists and assign the result to another list. Here is an example.
Example using + operator
# First list list_1 = ["a", "b", "c", "d", "e", "f"] # Second list list_2 = [1, 2, 3, 4, 5, 6] # Third List list_3 = ["A", "B", "C", "D", "E", "F"] # Concatenate list using + operator list_result = list_1 + list_2 + list_3 print(list_result)
Result
['a', 'b', 'c', 'd', 'e', 'f', 1, 2, 3, 4, 5, 6, 'A', 'B', 'C', 'D', 'E', 'F']
Using list.extend() method
Another practice to concatenate two lists is to use the list.extend() method. Using this method, you can merge or merge only two lists at the same time. For joining more then two lists, you have to use this method multiple times. Unlike + operator, list.extend() extends a list by appending the elements of another list at the end. Let us see an example of using list.extend().
Example using list.extend() method
# First list list_1 = ["a", "b", "c", "d", "e", "f"] # Second list list_2 = [1, 2, 3, 4, 5, 6] # Third List list_3 = ["A", "B", "C", "D", "E", "F"] # Concatenate list using list.extend() method list_1.extend(list_2) list_1.extend(list_3) print(list_1)
Result
['a', 'b', 'c', 'd', 'e', 'f', 1, 2, 3, 4, 5, 6, 'A', 'B', 'C', 'D', 'E', 'F']
Related articles
- Correct way to copy or clone a list in Python programming.
- Writing elements of a list to a file in Python.
Reference
- More about list in Python docs.