Explanation:
Topics: insert() del sum() list
Try it yourself:
x = [0, 1, 2]
x.insert(0, 1)
print(x) # [1, 0, 1, 2]
del x[1]
print(x) # [1, 1, 2]
print(sum(x)) # 4
insert() inserts an item at a given position.
The first argument is the index of the element before which to insert.
insert(0, 1) inserts 1 before index 0 (at the front of the list).
The del keyword deletes the given object.
In this case x[1]
The sum() function adds the items of a list (or a different iterable) and returns the sum.