how t get the combined ascii value of all letters in string python code example

Example 1: python ascii

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

Example 2: character to ascii python

asciiValue=ord(stringCharacter)
#example
asciiValue=ord('A') 
#in this example asciiValue equals 64