What is the output of this code? (Please explain)

Question

A =[x for x in range[
(4)]. Print(sum(a[1::-2]+ a[::-3]))

Answer 1

a = [0,1,2,3]
>>>a[1::-2]
[1]
The reason it returns [1] is because out of range slice indexes are handled gracefully when used for slicing. So, it starts from a[1] but it doesn't have stopping value and step is -2 which is out of range.

>>>a[::-3]
[3,0]
Since it has a negative step value, it includes elements starting from backwards with a step of 3.

>>>[1] + [0,3]
[1,0,3]

>>> sum([0,1,3])
4
The sum() takes a list and sum all values of this.

Answer 2

Thank you, Simba 🥺