Sync pre-release CPython 3.15 branch from GitHub (2026-07-02)

Summary:
Imported python/cpython `3.15.0b3+dev` from upstream rev [`7d8b0b3`](https://www.github.com/python/cpython/commit/7d8b0b3a81df388274402d4172e89f97e2ed0146) (committed 2026-07-02 03:20:31+00:00).

# Commit Info

- Base: (`3.15.0b3+dev`) - [`fc8d7ed`](https://www.github.com/python/cpython/commit/fc8d7edd56951e7b015d6d6d33a80639196c1197) (commit date: 2026-07-01 03:29:44+00:00)
- Imported: (`3.15.0b3+dev`) - [`7d8b0b3`](https://www.github.com/python/cpython/commit/7d8b0b3a81df388274402d4172e89f97e2ed0146) (commit date: 2026-07-02 03:20:31+00:00)

# Noteworthy file changes

- Low-signal files (11 added) (NEWS.d, docs, .github)

Complete list of added/removed files: https://www.internalfb.com/intern/everpaste/?color=0&handle=GJdgwCTtFJ3T8akDAD_PdHS9838ubr0LAAAz

Differential Revision: D110429001

fbshipit-source-id: a28b3601bba8f4dd169c1d8108bc1c030a642dbf

Author: generatedunixname1734921407115435

Doc/c-api/module.rst

@@ -488,7 +488,7 @@ defining the module state.
 
    .. versionadded:: 3.15
 
-      Use :c:member:`PyModuleDef.m_size` instead to support previous versions.
+      Use :c:member:`PyModuleDef.m_traverse` instead to support previous versions.
 
 .. c:macro:: Py_mod_state_clear
 

Lib/idlelib/News3.txt

@@ -4,6 +4,46 @@ Released on 2026-10-01
 =========================
 
 
+gh-152745:  When "Run... Customized" with "Restart shell" unchecked
+while Shell is running code, including waiting for an input('prompt:')
+response, just report that the shell is executing instead of
+reporting twice and restarting anyway.  Patch by Serhiy Storchaka.
+
+gh-152743: When an integer entry in IDLE's Settings dialog, such as
+"Auto squeeze min lines", is deleted, do not save '', which is an
+invalid configuration value.  Patch by Serhiy Storchaka.
+
+gh-152742: MakeChange the default extension when saving a Shell or
+Output window '.txt' and list text files before Python files.  Their
+content is not Python source. Patch by Serhiy Storchaka and Claude Code.
+
+gh-152740: Fill the "In files:" field of IDLE's Find in Files dialog
+with a full directory path, even for an unsaved editor or the Shell.
+In the grep output whow which directory was searched.  Patch by Serhiy
+Storchaka and Claude Code.
+
+gh-152739: Omit the idlelib directory from the path of the IDLE user
+process. User code imports such as `import help' can no longer import
+an idlelib submodule (here idlelib.help) instead of the intended
+top-level module.  Patch by Serhiy Storchaka and Claude Code.
+
+gh-152738: Fix a rare crash in the IDLE editor when the completion
+window is closed: deleting a key binding for a sequence that is not
+bound to the virtual event is now ignored instead of raising a
+ValueError. Patch by Serhiy Storchaka and Claude Code.
+
+gh-152737: Fix Replace All in the IDLE editor's Replace dialog when the
+search direction is "Up" and "Wrap around" is off: it now replaces all
+matches above the current position instead of only the first one.
+Patch by Serhiy Storchaka and Claude Code.
+
+gh-152733: For X11 window managers, set toplevel window classes to
+"Idle".  Patch by Serhiy Storchaka and Claude Code.
+
+gh-152728: Move functions run.fix_scaling, editor.fixwordbreaks
+(as 'fix_word_breaks') and pyshell.fix_x11_paste to module util.
+Patch by Terry J. Reedy.
+
 gh-85320: IDLE now reads and writes its configuration files and the
 breakpoints file using UTF-8 instead of the locale encoding.
 Files with non-ASCII characters and non-UTF-8 encoding may need

Lib/idlelib/configdialog.py

@@ -2265,7 +2265,11 @@ def make_callback(var, config):
         "Return default callback function to add values to changes instance."
         def default_callback(*params):
             "Add config values to changes instance."
-            changes.add_option(*config, var.get())
+            value = var.get()
+            # A blanked int entry is an empty string; do not save it as an
+            # invalid config value (gh-83653).
+            if value != '':
+                changes.add_option(*config, value)
         return default_callback
 
     def attach(self):

Lib/idlelib/editor.py

@@ -1704,19 +1704,10 @@ def get_accelerator(keydefs, eventname):
     return s
 
 
-def fixwordbreaks(root):
-    # On Windows, tcl/tk breaks 'words' only on spaces, as in Command Prompt.
-    # We want Motif style everywhere. See #21474, msg218992 and followup.
-    tk = root.tk
-    tk.call('tcl_wordBreakAfter', 'a b', 0) # make sure word.tcl is loaded
-    tk.call('set', 'tcl_wordchars', r'\w')
-    tk.call('set', 'tcl_nonwordchars', r'\W')
-
-
-def _editor_window(parent):  # htest #
-    # error if close master window first - timer event, after script
-    root = parent
-    fixwordbreaks(root)
+def _editor_window(root):  # htest #
+    # Error if close master window first - timer event, after script
+    from util import fix_word_breaks
+    fix_word_breaks(root)
     if sys.argv[1:]:
         filename = sys.argv[1]
     else:

Lib/idlelib/filelist.py

@@ -112,12 +112,12 @@ def canonize(self, filename):
 
 
 def _test():  # TODO check and convert to htest
+    # Maybe redundant with test_filelist.FileListTest.test_new_empty.
     from tkinter import Tk
-    from idlelib.editor import fixwordbreaks
-    from idlelib.run import fix_scaling
+    from idlelib.util import fix_scaling, fix_word_breaks
     root = Tk()
     fix_scaling(root)
-    fixwordbreaks(root)
+    fix_word_breaks(root)
     root.withdraw()
     flist = FileList(root)
     flist.new()

Lib/idlelib/grep.py

@@ -40,6 +40,20 @@ def grep(text, io=None, flist=None):
     dialog.open(text, searchphrase, io)
 
 
+def default_glob(path):
+    """Return the initial "In files:" pattern for a file path (gh-80504).
+
+    Always include a full directory so that grep output shows which
+    directory was searched.
+    """
+    dir, base = os.path.split(path)
+    dir = os.path.abspath(dir)  # An empty dir becomes the current directory.
+    head, tail = os.path.splitext(base)
+    if not tail:
+        tail = ".py"
+    return os.path.join(dir, "*" + tail)
+
+
 def walk_error(msg):
     "Handle os.walk error."
     print(msg)
@@ -103,11 +117,7 @@ def open(self, text, searchphrase, io=None):
             path = io.filename or ""
         else:
             path = ""
-        dir, base = os.path.split(path)
-        head, tail = os.path.splitext(base)
-        if not tail:
-            tail = ".py"
-        self.globvar.set(os.path.join(dir, "*" + tail))
+        self.globvar.set(default_glob(path))
 
     def create_entries(self):
         "Create base entry widgets and add widget for search path."

Lib/idlelib/idle_test/test_configdialog.py

@@ -1544,6 +1544,17 @@ def test_make_callback(self):
         self.assertEqual(changes['main']['section']['option'], '42')
         changes.clear()
 
+        # gh-83653: a blank int entry is not saved as bad config data.
+        sv = StringVar(root)
+        cb = self.tracers.make_callback(sv, ('main', 'section', 'option'))
+        sv.set('')
+        cb()
+        self.assertNotIn('section', changes['main'])
+        sv.set('5')
+        cb()
+        self.assertEqual(changes['main']['section']['option'], '5')
+        changes.clear()
+
     def test_attach_detach(self):
         tr = self.tracers
         iv = tr.add(self.iv, self.var_changed_increment)

Lib/idlelib/idle_test/test_editmenu.py

@@ -7,7 +7,7 @@
 import tkinter as tk
 from tkinter import ttk
 import unittest
-from idlelib import pyshell
+from idlelib.util import fix_x11_paste
 
 class PasteTest(unittest.TestCase):
     '''Test pasting into widgets that allow pasting.
@@ -18,7 +18,7 @@ class PasteTest(unittest.TestCase):
     def setUpClass(cls):
         cls.root = root = tk.Tk()
         cls.root.withdraw()
-        pyshell.fix_x11_paste(root)
+        fix_x11_paste(root)
         cls.text = tk.Text(root)
         cls.entry = tk.Entry(root)
         cls.tentry = ttk.Entry(root)

Lib/idlelib/idle_test/test_grep.py

@@ -37,6 +37,25 @@ def close(self):  # gui method
 _grep = Dummy_grep()
 
 
+class DefaultGlobTest(unittest.TestCase):
+
+    def test_no_path(self):
+        # gh-80504: an unsaved editor or the Shell has no path, so the
+        # pattern uses the current directory, not just '*.py'.
+        self.assertEqual(grep.default_glob(''),
+                         os.path.join(os.getcwd(), '*.py'))
+
+    def test_full_path(self):
+        path = os.path.join(os.path.abspath(os.sep), 'ab', 'foo.py')
+        self.assertEqual(grep.default_glob(path),
+                         os.path.join(os.path.dirname(path), '*.py'))
+
+    def test_other_extension(self):
+        path = os.path.join(os.path.abspath(os.sep), 'ab', 'foo.txt')
+        self.assertEqual(grep.default_glob(path),
+                         os.path.join(os.path.dirname(path), '*.txt'))
+
+
 class FindfilesTest(unittest.TestCase):
 
     @classmethod

Lib/idlelib/idle_test/test_multicall.py

@@ -43,6 +43,22 @@ def test_yview(self):
         mctext = self.mc(self.root)
         self.assertIs(mctext.yview.__func__, Text.yview)
 
+    def test_event_delete_unbound_sequence(self):
+        # gh-89360: deleting a sequence that was not added to a virtual
+        # event is ignored instead of raising ValueError.
+        mctext = self.mc(self.root)
+        mctext.event_add('<<tester>>', '<Control-Key-a>')
+        info = mctext.event_info('<<tester>>')
+        self.assertEqual(len(info), 1)
+
+        # A different sequence, never added: a no-op, not an error.
+        mctext.event_delete('<<tester>>', '<Control-Key-b>')
+        self.assertEqual(mctext.event_info('<<tester>>'), info)
+
+        # The added sequence can still be deleted normally.
+        mctext.event_delete('<<tester>>', '<Control-Key-a>')
+        self.assertNotIn(info[0], mctext.event_info('<<tester>>'))
+
 
 if __name__ == '__main__':
     unittest.main(verbosity=2)