python ascii

>>> ord('a')
97
>>> chr(97)
'a'
>>> chr(ord('a') + 3)
'd'
>>>

Here is what the above code is Doing:
1. ord(‘a’) returns the integer 97, which is the ASCII code for the character ‘a’.
2. chr(97) returns the character ‘a’.
3. chr(ord(‘a’) + 3) returns the character ‘d’.