How do I concatenate lists in Python in a memory-efficient way?

In Python, you can concatenate lists in a memory-efficient way by using the `itertools.chain` method. This allows you to combine multiple lists without creating additional copies of them in memory. Here's how to do it:


        from itertools import chain

        list1 = [1, 2, 3]
        list2 = [4, 5, 6]
        list3 = [7, 8, 9]

        concatenated_list = list(chain(list1, list2, list3))
        print(concatenated_list)  # Output: [1, 2, 3, 4, 5, 6, 7, 8, 9]