reach the elements in the list

[nilamo]

I'm guessing this is for python, as I'm not sure what phyton is.  That said, you can manipulate a list's contents via the indices of the list's items:

>>> items = list(range(10))
>>> items
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> items[1] = "second element"
>>> items
[0, 'second element', 2, 3, 4, 5, 6, 7, 8, 9]