Can you please explain the output of this code?

Question

A = [1, 2, 3, 4, 1]
for n in A:
A[n] = 0
print(A)

Answer is [0, 0, 3, 0, 1]

Answer 1

for in loops through an iterator of list A.

When pointing to first element:
n is 1
A[1] = 0
so A becomes [1, 0, 3, 4, 1]

When pointing to second element:
n is 0
A[0] = 0
so A becomes [0, 0, 3, 4, 1]
...