How does this code work?

Question

I saw it in Quiz Factory.
a = [1,1,2,3,5,8]
for a[1] in a:
pass
print(a)

Output:
[1,8,2,3,5,8]

Answer 1

"for var in iterable" assigns iterable's items to var in each iteration so "for a[1] in a" assigns a's items to a[1]
If you add "print(a[1])" to loop body you will get this:
1 1 2 3 5 8

Answer 2

for loop is running over the items in list

pass means do nothing in each iteration

a[1] is manupilated because instead of usually for i in range,
the quiz uses for a[1] in a,
So after for loop, a[1] is as the ending state of a[5] which is 8

Answer 3

Thanks. I got it.