first day of tutorials and i'm attempting what should be an easy one.

name = input("What is your name? ")
print("Hello " + name + "!")

on inputting an answer (Harry) i receive NameError: name 'Harry' is not defined

from a few different tutorials of python this same example seems to work, but on Pythonista it seems I need to define the variable in advance. Is that right? or am i missing something?