Help with challenge problem

Question

https://code.sololearn.com/cfu6jJHUvgYC/?ref=app

Can someone explain why the output came out the way it is? I thought the output would be [1] [3] since the function sets L as [] when that parameter isn’t given.

Answer 1

Because you call it twice. And both lists the function returns are the same list. Proved by printing the id() on both function calls. So it works as it should. What are you trying to do exactly?

Answer 2

It was one of the challenge problems I got wrong and I wasn’t sure about the solution. I understand it now.