pycharm builtin unresolved reference

You have the language version set to Python 3; raw_input in Python 2 is just input in Python 3 (input in Python 2 is eval(input()) in Python 3: What's the difference between raw_input() and input() in python3.x?).

To select the Python version, see: How to select Python version in PyCharm?

I was getting a similar issue. @property and ValueError were being shown as 'undefined'. I had mucked about with PyCharm's interpreter settings a bit beforehand, and I was able to fix it by using the File -> Invalidate Caches / Restart... and choosing the "Invalidate and Restart" command.