code: def runcode(self, code):
          
          try:
              exec code in self.locals
          except SystemExit:
              raise
          except:
              self.showtraceback()
          else:
              if softspace(sys.stdout, 0):
                  sys.stdout.write('\n')
docs: Execute a code object.
  
          When an exception occurs, self.showtraceback() is called to
          display a traceback.  All exceptions are caught except
          SystemExit, which is reraised.
  
          A note about KeyboardInterrupt: this exception may occur
          elsewhere in this code, and may not always be caught.  The
          caller should be prepared to deal with it.