raw_input() was renamed to input()
In Python 2 raw_input() returned the raw string. input(), on the other hand ran eval(raw_input()) which meant it tried to execute the input string as a piece of Python code. This was dangerous and was not really used.
In Python 3 raw_input() is gone. input() behaves as the old raw_input() returning the raw string. If you would like to get the old, and dangerous, behavior of input() you can call eval(input()).