Actually, with the release of Python 3, there are many things changed such as print() becomes a function in Python 3 which was just a simple statement in Python 2 same happens with raw_input() it got replaced by input() so, you just need input() not raw_input().
You can use the following video tutorials to clear all your doubts:-
If you are looking for upskilling yourself in python you can join our Python Training and learn from the industry expert.