commit 98f157de1260801fd26c72eb6bfae0d9295e5ab3
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Thu Oct 21 14:02:20 2021 -0700
committer GitHub <noreply@github.com> Thu Oct 21 23:02:20 2021 +0200
tree 0ebf23084274621714c64a895c11517d7e2d6250
parent 828722aca4ccba893f6b2e8c1d41fd74fd6e208d

bpo-45160: Ttk optionmenu only set variable once (GH-28291) (GH-29131)

(cherry picked from commit add46f84769a7e6fafa50954f79b7c248231fa4e)

Co-authored-by: E-Paine <63801254+E-Paine@users.noreply.github.com>

Lib/tkinter/ttk.py

diff --git a/Lib/tkinter/ttk.py b/Lib/tkinter/ttk.py
index b854235..acdd565 100644
--- a/Lib/tkinter/ttk.py
+++ b/Lib/tkinter/ttk.py
@@ -1643,7 +1643,10 @@ def set_menu(self, default=None, *values):
         menu.delete(0, 'end')
         for val in values:
             menu.add_radiobutton(label=val,
-                command=tkinter._setit(self._variable, val, self._callback),
+                command=(
+                    None if self._callback is None
+                    else lambda val=val: self._callback(val)
+                ),
                 variable=self._variable)
 
         if default: