This may be repeated, but none of the existing answers solved my problem.
So, I'm using Python 2.7, and I get this error (title) whenever I try this:
number = int(raw_input('Number : '))
I tried this in Sublime Text 2, compileronline.com and in codecademy; it fails in the first 2 of this sites. It works on codecademy and in the terminal compiler, but I can't understand exactly why it is failing.