bpo-36958: In IDLE, print exit message (GH-13435)

Print any argument other than None or int passed to SystemExit
or sys.exit().

1 files changed, 6 insertions, 5 deletions

diff --git a/Lib/idlelib/run.py b/Lib/idlelib/run.py
index 6fa373f..b4a2b54 100644
--- a/Lib/idlelib/run.py
+++ b/Lib/idlelib/run.py
@@ -474,15 +474,16 @@ class Executive(object):
                 exec(code, self.locals)
             finally:
                 interruptable = False
-        except SystemExit:
-            # Scripts that raise SystemExit should just
-            # return to the interactive prompt
-            pass
+        except SystemExit as e:
+            if e.args:  # SystemExit called with an argument.
+                ob = e.args[0]
+                if not isinstance(ob, (type(None), int)):
+                    print('SystemExit: ' + str(ob), file=sys.stderr)
+            # Return to the interactive prompt.
         except:
             self.usr_exc_info = sys.exc_info()
             if quitting:
                 exit()
-            # even print a user code SystemExit exception, continue
             print_exception()
             jit = self.rpchandler.console.getvar("<<toggle-jit-stack-viewer>>")
             if jit: