python assign values to list elements in loop

Is this a valid python behavior? I would think that the end result should be [0,0,0] and the id() function should return identical values each iteration. How to make it pythonic, and not use enumerate or range(len(bar))?

bar = [1,2,3]
print bar
for foo in bar:
    print id (foo)
    foo=0
    print id(foo)
print bar

output:

[1, 2, 3]
5169664
5169676
5169652
5169676
5169640
5169676
[1, 2, 3]