Answer 1

https://code.sololearn.com/c66whNN3Q3AJ/?ref=app

You can do like this

Answer 2

First you updated a[0] = 0 then you passed a slice of the list as argument
, it's same as passing [2,3,4] and it would do it's task for the given list([2,3,4]) and why would it change in a .

Let me explain
If you are sending a as argument and you changed something then that would change in a, but if you are sending some other list as argument then why would it change a.

Answer 3

https://www.geeksforgeeks.org/pass-by-reference-vs-value-in-JUMP_LINK__&&__python__&&__JUMP_LINK/amp/#aoh=16335906588566&referrer=https%3A%2F%2Fwww.google.com&amp_tf=From%20%251%24s

This can clarify your question