Question

If i have a string like this: asdf5493

I need the last four digits and i get it by doing this:

strVar[-4:]

Is it possible to then see if they are all numbers?

Answer 1

strVar[-4:].isdigit()

tests if all four characters are digits. Documentation

EDIT: If your actual goal is to convert this number to an integer, the usual idiom in Python is to just try to do this, and catch the exception in case it fails:

s = strVar[-4:]
try:
    i = int(s)
except ValueError:
    # handle the case that it isn't all digits