godarda@gd:~$ python3
...
>>> gd="GoDarda"
>>> gd
'GoDarda'

>>> len(gd)
12

>>> gd[0]
'K'

>>> gd[11]
'w'
>>> gd[0:12:1]
'GoDarda'

>> gd[0:12:2]
'KdnWno'

>>> gd[0:12:3]
'KiWd'

>>> gd[::-1]    reverse the given string
'wodniWgnidoK'
>>> gd[::1]
'GoDarda'

>>> gd[::2]
'KdnWno'

>>> gd[::3]
'KiWd'
>>> gd[1::]
'odingWindow'

>>> gd[2::]
'dingWindow'

>>> gd[3::]
'ingWindow'