gh-103685: Fix tkinter.Menu.index() for Tk 8.7 (#103686)

---------

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>

3 files changed, 7 insertions, 2 deletions

diff --git a/Lib/test/test_tkinter/test_widgets.py b/Lib/test/test_tkinter/test_widgets.py
index 64c9472..ba4ef49 100644
--- a/Lib/test/test_tkinter/test_widgets.py
+++ b/Lib/test/test_tkinter/test_widgets.py
@@ -1377,6 +1377,11 @@ class MenuTest(AbstractWidgetTest, unittest.TestCase):
     def create(self, **kwargs):
         return tkinter.Menu(self.root, **kwargs)
 
+    def test_indexcommand_none(self):
+        widget = self.create()
+        i = widget.index('none')
+        self.assertIsNone(i)
+
     def test_configure_postcommand(self):
         widget = self.create()
         self.checkCommandParam(widget, 'postcommand')
diff --git a/Lib/tkinter/__init__.py b/Lib/tkinter/__init__.py
index 479daf0..bf0b3b9 100644
--- a/Lib/tkinter/__init__.py
+++ b/Lib/tkinter/__init__.py
@@ -3430,8 +3430,7 @@ class Menu(Widget):
     def index(self, index):
         """Return the index of a menu item identified by INDEX."""
         i = self.tk.call(self._w, 'index', index)
-        if i == 'none': return None
-        return self.tk.getint(i)
+        return None if i in ('', 'none') else self.tk.getint(i)  # GH-103685.
 
     def invoke(self, index):
         """Invoke a menu item identified by INDEX and execute
diff --git a/Misc/NEWS.d/next/Library/2023-04-24-00-34-23.gh-issue-103685.U14jBM.rst b/Misc/NEWS.d/next/Library/2023-04-24-00-34-23.gh-issue-103685.U14jBM.rst
new file mode 100644
index 0000000..31df047
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2023-04-24-00-34-23.gh-issue-103685.U14jBM.rst
@@ -0,0 +1 @@
+Prepare :meth:`tkinter.Menu.index` for Tk 8.7 so that it does not raise ``TclError: expected integer but got ""`` when it should return ``None``.