gh-130356: Add default values to the parameters of the widget tkinter.OptionMenu

Doc/whatsnew/3.14.rst

@@ -809,6 +809,9 @@ tkinter
   arguments passed by keyword.
   (Contributed by Zhikang Yan in :gh:`126899`.)
 
+* Add default values to the initialization parameters of class
+  :class:`!tkinter.OptionMenu`.
+  (Contributed by Zhikang Yan in :gh:`130356`.)
 
 turtle
 ------

Lib/test/test_tkinter/test_widgets.py

@@ -354,6 +354,9 @@ def test_bad_kwarg(self):
         with self.assertRaisesRegex(TclError, r"^unknown option -image$"):
             tkinter.OptionMenu(self.root, None, 'b', image='')
 
+    def test_default_parameters(self):
+        tkinter.OptionMenu(self.root)
+
 @add_configure_tests(IntegerSizeTests, StandardOptionsTests)
 class EntryTest(AbstractWidgetTest, unittest.TestCase):
     _rounds_pixels = (tk_version < (9, 0))

Lib/tkinter/__init__.py

@@ -4180,7 +4180,7 @@ def __call__(self, *args):
 class OptionMenu(Menubutton):
     """OptionMenu which allows the user to select a value from a menu."""
 
-    def __init__(self, master, variable, value, *values, **kwargs):
+    def __init__(self, master=None, variable=None, value="", *values, **kwargs):
         """Construct an optionmenu widget with the parent MASTER, with
         the resource textvariable set to VARIABLE, the initially selected
         value VALUE, the other menu values VALUES and an additional

Misc/NEWS.d/next/Library/2025-02-23-06-49-26.gh-issue-130356._VDYmg.rst

@@ -0,0 +1,2 @@
+Add default values to the initialization parameters of class
+:class:`!tkinter.OptionMenu`.