Get the last 4 characters of a string [duplicate]

Like this:

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

This slices the string’s last 4 characters. The -4 starts the range from the string’s end. A modified expression with [:-4] removes the same 4 characters from the end of the string:

>>> mystr[:-4]
'abcdefgh'

For more information on slicing see this Stack Overflow answer.