get last two characters of a string python code example

Example 1: how to select last 2 elements in a string python

>>>mystr = "abcdefghijkl"
>>>mystr[-4:]
'ijkl'

>>>mystr[:-4] #to select all but last 4 characters
'abcdefgh'

Example 2: how to find the last occurrence of a character in a string in python

original_string = "sentence one. sentence two. sentence three"

last_char_index = original_string.rfind(".")
new_string = original_string[:last_char_index] + "," + original_string
print(new_string)
"sentence one. sententce two, sentence three"