Can someone explain why this is the output for this code?

Question

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

Output:
[0,0,3,0,1]

Answer 1

Firstly I think this is what you are trying to do:
for i in range(0, len(A)):
A[i] = 0

The reason why the code outputted that is because
for n in A:
accesses the values in the list so when you do A[n] it goes to that index i.e. in the first iteration it accesses the element of index 1 (2nd element) because that's the first value in the list. Then at the second iteration the 2nd element is 0 which means python will go to the first element of the list and change it to 0, I think you get the point now.

Answer 2

Hi, I wrote your code here: https://code.sololearn.com/cIjyyBy6Jw5b/?ref=app
With additional print, we can see how you modify your array and what is the impact on your output 😁