PyCharm “no module named sys”

Question

Using PyCharm community edition and Python 2.7,

import traceback
import sys

No problem on the first line, which implies that I have pointed PyC

Answer 1

Make sure you've chosen the right Interpreter path and check some other run settings. Go to Run > Edit Configurations... and check, if some configurations seem to be wrong.

EDIT: Under Linux, you have often Python 2 and 3 installed, be sure to pick the correct one.