How to add a list to another list in python at a certain index

Question

For example, how do i do this:

x=[1,2,3]
y=[4,5,6]
list3=[1,4,5,6,2,3]

i do not want [1,[4,5,6],2,3]

basically i want to extend it, but at a given index

Does this answer your question? [How to insert multiple elements into a list?](https://stackoverflow.com/questions/39541370/how-to-insert-multiple-elements-into-a-list) — wjandrea, Aug 22 '21 at 18:22
BTW, welcome to Stack Overflow! Check out the [tour], and [ask] if you want tips. This is a nice first question, though it'd be even better if you had done your own research first. I found the above question by googling `python insert multiple items into list`. — wjandrea, Aug 22 '21 at 18:23
i used list.insert(index,list2) to insert the 2nd list at given index, but i need it to be inserted as individual integers, not collectively as a list — Keshav Nair, Aug 22 '21 at 18:23
Welcome to Stack Overflow. Please add minimal reproducible example, or at least an attempt. See https://stackoverflow.com/help/how-to-ask — cards, Aug 22 '21 at 21:58

score 3 · Accepted Answer · answered Aug 22 '21 at 18:22

3

Select an empty slice at the index you want, and insert the other list there:

>>> x=[1,2,3]
>>> y=[4,5,6]
>>> x[1:1]=y
>>> x
[1, 4, 5, 6, 2, 3]

answered Aug 22 '21 at 18:22

Mark Tolonen

score 0 · Answer 2 · answered Aug 22 '21 at 18:22

0

Use slice assignment.

list3 = x[:] # make copy of x
list3[1:1] = y # replace empty slice at index 1

answered Aug 22 '21 at 18:22

Barmar

2 Answers2