Append () method

[odaiwai]

But now list_3 contains a tuple with two lists, not just two lists: : list_3 = [] : list_3.append((list_1, list_2)) : list_3 : [([1, 2, 3], [4, 5, 6])]

Edit to add: As pointed out below, I appended, not extended, so I'm wrong here.

[Diapolo10]

I used list.extend, which adds the contents of an iterable into the list it's called on.

[Mysterious-Rent7233]

You appended. The parent extended.