Issue #24790: correct typo noticed by Eric Smith
diff --git a/Lib/idlelib/StackViewer.py b/Lib/idlelib/StackViewer.py
index e62e6f5..ccc755c 100644
--- a/Lib/idlelib/StackViewer.py
+++ b/Lib/idlelib/StackViewer.py
@@ -120,7 +120,7 @@
             sublist.append(item)
         return sublist
 
-    def keys(self):  # unused, left for possible 3rd parcy use
+    def keys(self):  # unused, left for possible 3rd party use
         return list(self.object.keys())
 
 def _stack_viewer(parent):