[3.11] gh-102832: IDLE - remove use of deprecated sys.last_xyzs for stackviewer (GH-103339) (#105527)

gh-102832: IDLE - remove use of deprecated sys.last_xyzs for stackviewer (GH-103339)
(cherry picked from commit 3ee921d84f06da9dfa8aa29e0d33778b9dbf8f23)

Co-authored-by: Irit Katriel <1055913+iritkatriel@users.noreply.github.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/Lib/idlelib/pyshell.py b/Lib/idlelib/pyshell.py
index bdde156..3141b47 100755
--- a/Lib/idlelib/pyshell.py
+++ b/Lib/idlelib/pyshell.py
@@ -1363,19 +1363,19 @@ class PyShell(OutputWindow):
                 self.text.tag_remove(self.user_input_insert_tags, index_before)
             self.shell_sidebar.update_sidebar()
 
-    def open_stack_viewer(self, event=None):
+    def open_stack_viewer(self, event=None):  # -n mode only
         if self.interp.rpcclt:
             return self.interp.remote_stack_viewer()
+
+        from idlelib.stackviewer import StackBrowser
         try:
-            sys.last_traceback
+            StackBrowser(self.root, sys.last_value, self.flist)
         except:
             messagebox.showerror("No stack trace",
                 "There is no stack trace yet.\n"
-                "(sys.last_traceback is not defined)",
+                "(sys.last_value is not defined)",
                 parent=self.text)
-            return
-        from idlelib.stackviewer import StackBrowser
-        StackBrowser(self.root, self.flist)
+        return None
 
     def view_restart_mark(self, event=None):
         self.text.see("iomark")