Please help me with an explanation, regarding the answer to this code

Question

https://code.sololearn.com/c1oJ3SvzP0tV/?ref=app

Answer 1

1) step
n=1
A[n]=A[1]=0
# output [1,0,3,4,1]

2) step
n=0
A[0]=0
# output [0,0,3,4,1]

3) step
n=3
A[3]=0
#output [0,0,3,0,1]
4) step
n=0
5) step
n=1

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

Answer 2

In all cases and for each iteration n will not have the values 2 and 4 so first value of n not altered are 3 and 1 .
n has the value 1 then 0 then 3 then 1 so no A[3] and no A[4] that will keep their initial values

Answer 3

#Run this code and see how there changing..

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

#If not clear, give a reply......

Answer 4

Put 1,2,.... One by one in
A[n]
in place of n
It will be clear to you.