python lists - access by index

>t = ['a', 'b', 'c', 'd']
>#   0   1    2    3      indexes to the left of values
>t[0]                   # access the value to the right of index
'a'
>t[0:2]                 # slice the list from index 0 to index 2
['a', 'b']
>t[1:]                  # slice the list from index 1 to the end
['b', 'c', 'd']
>t[1:-1]                # slice the list from index 1 to one but last
['b', 'c']
>t[:]                   # create a copy of the list
['a', 'b', 'c', 'd']
>#  | a | b | c | d | a | b | c | d |   value
># -4  -3  -2  -1   0   1   2   3   4   indexes