I did the Python Challenge but didn't understand why this code got the answer.

Question

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

Answer = [0,0,3,0,1]

Answer 1

1st iteration :
[1,2,3,4,1]
¯
n=1
A[1] = 0
[1,0,3,4,1]

2nd iteration :
[1,0,3,4,1]
¯
n=0
A[0] = 0
[0,0,3,4,1]

3rd iteration :
[0,0,3,4,1]
¯
n=3
A[3] = 0
[0,0,3,0,1]

4th iteration :
[0,0,3,0,1]
¯
n=0
A[0] = 0
[0,0,3,0,1]

5th iteration :
[0,0,3,0,1]
¯
n=1
A[1] = 0
[0,0,3,0,1]

So, the tricky part is that array changes after each iteration and therefore value of variable n changes.

Answer 2

Thank you very much.Now I understand.