codeaft@codeaft:~$ python3
...
>>> codeaft="Codeaft"
>>> codeaft
'Codeaft'

>>> len(codeaft)
12

>>> codeaft[0]
'K'

>>> codeaft[11]
'w'
>>> codeaft[0:12:1]
'Codeaft'

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

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

>>> codeaft[::-1]    reverse the given string
'wodniWgnidoK'
>>> codeaft[::1]
'Codeaft'

>>> codeaft[::2]
'KdnWno'

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

>>> codeaft[2::]
'dingWindow'

>>> codeaft[3::]
'ingWindow'