list sort() function bring backs None

[Yoriz]

That is because the list sort method sorts in place and returns None

list1 = [3, 4, 1, 2]
list2 = list1.sort()
print(list1)
print(list2)

Output:
[1, 2, 3, 4]
None

Use sorted if you want to get a sperate sorted version

list1 = [3, 4, 1, 2]
list2 = sorted(list1)
print(list1)
print(list2)

Output:
[3, 4, 1, 2]
[1, 2, 3, 4]

---

@menator01 Your code has two variables list1 & list2 that point to the same list object

list1 = [3, 4, 1, 2]
list2 = list1
list2.sort()
print(list1)
print(list2)

Output:
[1, 2, 3, 4]
[1, 2, 3, 4]