title: Presence check on python?
body: <p>Hi im new with python but in my school i was asked to write a code that ask the user to input a word and a sentence with few feature but it must have a presence check (so the user cant just leave the question blank or the word) but i dont know how to put a presence check, also if the word or sentence is left blank the user should be able to re-enter it again. can anyone help me?</p>