Output is 00301 i don't got it

Question

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

Answer 1

So look at the transformation of A
-zero index in A
A[1] = 0
A = [0,0,3,4,1]
-first index in A
A[0] = 0
A = [0,0,3,4,1]
-second index in A
A[3] = 0
A = [0,0,3,0,1]
-third index in A
A[0] = 0
A = [0,0,3,0,1]
-fourth index in A
A[1] = 0
A = [0,0,3,0,1]
If you study this very well, you'll understand the meaning of that loop