gh-153422: Return bool from some tkinter query methods (GH-153429)

The winfo_exists(), winfo_ismapped() and winfo_viewable() methods of
tkinter widgets and Text.edit_modified() now return a bool instead of an
integer or, depending on wantobjects, a string.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: serhiy-storchaka

Doc/library/tkinter.rst

@@ -2066,7 +2066,7 @@ Base and mixin classes
 
    .. method:: winfo_exists()
 
-      Return ``1`` if the widget exists, ``0`` otherwise.
+      Return ``True`` if the widget exists, ``False`` otherwise.
 
    .. method:: winfo_fpixels(number)
 
@@ -2115,7 +2115,7 @@ Base and mixin classes
 
    .. method:: winfo_ismapped()
 
-      Return ``1`` if the widget is currently mapped, ``0`` otherwise.
+      Return ``True`` if the widget is currently mapped, ``False`` otherwise.
 
    .. method:: winfo_manager()
 
@@ -2246,8 +2246,8 @@ Base and mixin classes
 
    .. method:: winfo_viewable()
 
-      Return ``1`` if the widget and all of its ancestors up through the
-      nearest toplevel window are mapped, ``0`` otherwise.
+      Return ``True`` if the widget and all of its ancestors up through the
+      nearest toplevel window are mapped, ``False`` otherwise.
 
    .. method:: winfo_visual()
 
@@ -5737,7 +5737,7 @@ Widget classes
    .. method:: edit_modified(arg=None)
 
       If *arg* is omitted, return the current state of the modified flag as
-      ``0`` or ``1``; the flag is set automatically whenever the text is
+      a :class:`bool`; the flag is set automatically whenever the text is
       inserted or deleted.
       Otherwise set the flag to the boolean *arg*.
 

Doc/library/tkinter.ttk.rst

@@ -1372,7 +1372,7 @@ ttk.Treeview
       Without arguments, returns a tuple of all detached items,
       but not their descendants (see :meth:`detached_all`).
       With *item*, returns whether *item* is detached; since Tk 9.1, also
-      returns true if an ancestor of *item* is detached.
+      returns ``True`` if an ancestor of *item* is detached.
 
       Requires Tk 9.0 or newer.
 

Lib/test/test_tkinter/test_images.py

@@ -694,12 +694,12 @@ def test_data(self):
 
     def test_transparency(self):
         image = self.create()
-        self.assertEqual(image.transparency_get(0, 0), True)
-        self.assertEqual(image.transparency_get(4, 6), False)
+        self.assertIs(image.transparency_get(0, 0), True)
+        self.assertIs(image.transparency_get(4, 6), False)
         image.transparency_set(4, 6, True)
-        self.assertEqual(image.transparency_get(4, 6), True)
+        self.assertIs(image.transparency_get(4, 6), True)
         image.transparency_set(4, 6, False)
-        self.assertEqual(image.transparency_get(4, 6), False)
+        self.assertIs(image.transparency_get(4, 6), False)
         self.assertRaises(tkinter.TclError, image.transparency_get, -1, 0)
         self.assertRaises(tkinter.TclError, image.transparency_get, 16, 0)
         self.assertRaises(tkinter.TclError, image.transparency_set, -1, 0, True)

Lib/test/test_tkinter/test_misc.py

@@ -905,13 +905,26 @@ def test_winfo_visual_info(self):
             self.assertIsInstance(name, str)
             self.assertIsInstance(depth, int)
 
+    def test_winfo_exists(self):
+        f = tkinter.Frame(self.root)
+        self.assertIs(f.winfo_exists(), True)
+        f.destroy()
+        self.assertIs(f.winfo_exists(), False)
+
+    def test_winfo_ismapped(self):
+        f = tkinter.Frame(self.root)
+        self.assertIs(f.winfo_ismapped(), False)
+        f.pack()
+        self.root.update()
+        self.assertIs(f.winfo_ismapped(), True)
+
     def test_winfo_viewable(self):
         f = tkinter.Frame(self.root)
-        self.assertFalse(f.winfo_viewable())
+        self.assertIs(f.winfo_viewable(), False)
         f.pack()
         f.wait_visibility()
         self.root.update()
-        self.assertTrue(f.winfo_viewable())
+        self.assertIs(f.winfo_viewable(), True)
 
     @requires_tk(9, 1)
     def test_winfo_isdark(self):

Lib/test/test_tkinter/test_text.py

@@ -18,10 +18,10 @@ def test_debug(self):
         text = self.text
         olddebug = text.debug()
         try:
-            text.debug(0)
-            self.assertEqual(text.debug(), 0)
-            text.debug(1)
-            self.assertEqual(text.debug(), 1)
+            text.debug(False)
+            self.assertIs(text.debug(), False)
+            text.debug(True)
+            self.assertIs(text.debug(), True)
         finally:
             text.debug(olddebug)
             self.assertEqual(text.debug(), olddebug)
@@ -293,13 +293,13 @@ def test_tag_cget_configure(self):
 
     def test_edit_modified(self):
         text = self.text
-        self.assertEqual(text.edit_modified(), 0)
+        self.assertIs(text.edit_modified(), False)
         text.insert('1.0', 'spam')
-        self.assertEqual(text.edit_modified(), 1)
+        self.assertIs(text.edit_modified(), True)
         text.edit_modified(False)
-        self.assertEqual(text.edit_modified(), 0)
+        self.assertIs(text.edit_modified(), False)
         text.edit_modified(True)
-        self.assertEqual(text.edit_modified(), 1)
+        self.assertIs(text.edit_modified(), True)
 
     def test_edit_undo_redo(self):
         text = self.text

Lib/test/test_ttk/test_widgets.py

@@ -1685,9 +1685,9 @@ def test_detach_reattach(self):
         self.assertEqual(self.tv.get_children(item_id), ())
 
     def test_exists(self):
-        self.assertEqual(self.tv.exists('something'), False)
-        self.assertEqual(self.tv.exists(''), True)
-        self.assertEqual(self.tv.exists({}), False)
+        self.assertIs(self.tv.exists('something'), False)
+        self.assertIs(self.tv.exists(''), True)
+        self.assertIs(self.tv.exists({}), False)
 
         # the following will make a tk.call equivalent to
         # tk.call(treeview, "exists") which should result in an error

Lib/tkinter/__init__.py

@@ -1332,8 +1332,8 @@ def winfo_depth(self):
         return self.tk.getint(self.tk.call('winfo', 'depth', self._w))
 
     def winfo_exists(self):
-        """Return true if this widget exists."""
-        return self.tk.getint(
+        """Return True if this widget exists."""
+        return self.tk.getboolean(
             self.tk.call('winfo', 'exists', self._w))
 
     def winfo_fpixels(self, number):
@@ -1370,8 +1370,8 @@ def winfo_isdark(self): # new in Tk 9.1
             self.tk.call('winfo', 'isdark', self._w))
 
     def winfo_ismapped(self):
-        """Return true if this widget is mapped."""
-        return self.tk.getint(
+        """Return True if this widget is mapped."""
+        return self.tk.getboolean(
             self.tk.call('winfo', 'ismapped', self._w))
 
     def winfo_manager(self):
@@ -1498,8 +1498,8 @@ def winfo_toplevel(self):
             'winfo', 'toplevel', self._w))
 
     def winfo_viewable(self):
-        """Return true if the widget and all its higher ancestors are mapped."""
-        return self.tk.getint(
+        """Return True if the widget and all its higher ancestors are mapped."""
+        return self.tk.getboolean(
             self.tk.call('winfo', 'viewable', self._w))
 
     def winfo_visual(self):
@@ -4207,6 +4207,8 @@ def edit_modified(self, arg=None):
         modified flag. If boolean is specified, sets the
         modified flag of the widget to arg.
         """
+        if arg is None:
+            return self.tk.getboolean(self.edit("modified"))
         return self.edit("modified", arg)
 
     def edit_redo(self):

Lib/tkinter/ttk.py

@@ -1604,7 +1604,7 @@ def detached(self, item=None):
 
         Without arguments, return a tuple of all detached items (but not
         their descendants; see detached_all).  With item, return whether item
-        is detached; since Tk 9.1, also return true if an ancestor of item
+        is detached; since Tk 9.1, also return True if an ancestor of item
         is detached.
 
         * Availability: Tk 9.0"""
@@ -2031,8 +2031,8 @@ def tag_configure(self, tagname, option=None, **kw):
 
 
     def tag_has(self, tagname, item=None):
-        """If item is specified, returns 1 or 0 depending on whether the
-        specified item has the given tagname. Otherwise, returns a list of
+        """If item is specified, returns True if the specified item has the
+        given tagname, False otherwise. Otherwise, returns a list of
         all items which have the specified tag.
 
         * Availability: Tk 8.6"""

Misc/NEWS.d/next/Library/2026-07-09-12-35-19.gh-issue-153422.tKb0Xq.rst

@@ -0,0 +1,4 @@
+:meth:`!winfo_exists`, :meth:`!winfo_ismapped` and :meth:`!winfo_viewable`
+methods of :mod:`tkinter` widgets and :meth:`!edit_modified` of
+:class:`tkinter.Text` now return a :class:`bool` instead of an integer or,
+depending on ``wantobjects``, a string.