A simple problem , but have no clue about solving it

Question

Suppose I have 2 lists , such as s and new_s :
s = [[]]
new_s = s
I want to add new_s the same elements in s , and then add a new number to any inner list of new_s without adding to s . Like this
s = [[],[22],[3]]
new_s = s
For i in new_s:
i.append(1)
Print(new_s , s)
I expect the outputs to be 2 different lists (like this : [[1],[22,1],[3,1]] [[][22],[3]] ) , but they are all same .. how can I solve it ? I need a way to get rid of this small problem .

Answer 1

Sorry, just saw that you have nested lists, which means you'll need to do a deep copy, which can be done using the copy module.

https://code.sololearn.com/cJk1PHb4B6nm/?ref=app

Answer 2

new_s = s
Means that both new_s and s point to the same list. I.E. new_s is s = True
You need to make a copy() of s. Then you can add and remove etc from 1 without effecting the other.
new_s = s.copy()

Answer 3

ChaoticDawg thank you very much ChaoticDawg .

Answer 4

ChaoticDawg hmmm ... but it did not work