Why can I use a list index as an indexing variable in a for loop? [duplicate]

Answer 1

It is an interesting question, and you can understand it by that:

for v in a:
    a[-1] = v
    print(a[-1])

print(a)

actually a becomes: [0, 1, 2, 2] after loop

Output:

0
1
2
2
[0, 1, 2, 2]

I hope that helps you, and comment if you have further questions. : )