Hello can someone explain how does it process

Question

a = [0,1,2,3]
for a[1] in a:
print(a[1])

output :
0
0
2
3

Answer 1

Like this:
a = [0,1,2,3]
for b in a:
a[1]=b
print(a[1])

output :
0
0
2
3

Answer 2

You are welcome

Answer 3

oohhh I see now I understand it, thank youuuuu^