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

I had this problem as well and was completely stymied until I tried the following:

File -> 
Default Settings -> 
Project Interpreter
  dropdown (click the arrow) ->
Show All ->
  select your interpreter ->
Show Paths
  (bottom icon on right) ->
Add Path ->
  Enter path to libraries
  (in my case this was c:\Python35\Lib).