Eventloops are not created if IPY_TEST_SIMPLE_PROMPT set, or not a tty.

IPython/terminal/ptshell.py

@@ -383,6 +383,7 class TerminalInteractiveShell(InteractiveShell):
             except KeyboardInterrupt:
                 print("\nKeyboardInterrupt escaped interact()\n")
 
+        if hasattr(self, '_eventloop'):
         self._eventloop.close()
 
     _inputhook = None