Sync pre-release CPython 3.15 branch from GitHub (2026-07-10)

Summary:
Imported python/cpython `3.15.0b3+dev` from upstream rev [`cb912e1`](https://www.github.com/python/cpython/commit/cb912e108c590bb0b8ded55653e63ad47f945362) (committed 2026-07-10 02:49:38+00:00).

# Commit Info

- Base: (`3.15.0b3+dev`) - [`9fb25cb`](https://www.github.com/python/cpython/commit/9fb25cbd41410fb9bdf230d6242f0358885405ae) (commit date: 2026-07-09 04:15:30+00:00)
- Imported: (`3.15.0b3+dev`) - [`cb912e1`](https://www.github.com/python/cpython/commit/cb912e108c590bb0b8ded55653e63ad47f945362) (commit date: 2026-07-10 02:49:38+00:00)

# Noteworthy file changes

- Native files (1 added):
  ```
  + Modules/_testlimitedcapi/run.c
  ```
- Low-signal files (5 added) (NEWS.d, docs, .github)

Complete list of added/removed files: https://www.internalfb.com/intern/everpaste/?color=0&handle=GFswySKOrRxOrfsEAI7E_EwwpT0Ybr0LAAAz

Reviewed By: DinoV

Differential Revision: D111395278

fbshipit-source-id: d478faa6c0982e14b26152941f20932c5cb7f279

Author: ambv

Doc/library/tkinter.rst

@@ -2015,7 +2015,7 @@ 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)
 
@@ -2054,7 +2054,7 @@ 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()
 
@@ -2185,8 +2185,8 @@ 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()
 
@@ -5591,7 +5591,7 @@ 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
+      true or false; the flag is set automatically whenever the text is
       inserted or deleted.
       Otherwise set the flag to the boolean *arg*.
 

Doc/library/urllib.parse.rst

@@ -649,8 +649,9 @@ task isn't already covered by the URL parsing functions above.
 
    The optional *encoding* and *errors* parameters specify how to deal with
    non-ASCII characters, as accepted by the :meth:`str.encode` method.
-   *encoding* defaults to ``'utf-8'``.
-   *errors* defaults to ``'strict'``, meaning unsupported characters raise a
+   Although these parameters default to ``None`` in the function signature,
+   when processing :class:`str` inputs, *encoding* effectively defaults to ``'utf-8'``
+   and *errors* to ``'strict'``, meaning unsupported characters raise a
    :class:`UnicodeEncodeError`.
    *encoding* and *errors* must not be supplied if *string* is a
    :class:`bytes`, or a :class:`TypeError` is raised.

Include/cpython/pythonrun.h

@@ -40,6 +40,11 @@ PyAPI_FUNC(PyObject *) PyRun_FileExFlags(
     PyCompilerFlags *flags);
 
 
+PyAPI_FUNC(PyObject *) Py_CompileStringFlags(
+    const char *str,
+    const char *filename,
+    int start,
+    PyCompilerFlags *flags);
 PyAPI_FUNC(PyObject *) Py_CompileStringExFlags(
     const char *str,
     const char *filename,       /* decoded from the filesystem encoding */

Include/internal/pycore_pylifecycle.h

@@ -111,9 +111,6 @@ extern int _Py_LegacyLocaleDetected(int warn);
 // Export for 'readline' shared extension
 PyAPI_FUNC(char*) _Py_SetLocaleFromEnv(int category);
 
-// Export for special main.c string compiling with source tracebacks
-int _PyRun_SimpleStringFlagsWithName(const char *command, const char* name, PyCompilerFlags *flags);
-
 
 /* interpreter config */
 

Include/internal/pycore_pythonrun.h

@@ -8,23 +8,18 @@ extern "C" {
 #  error "this header requires Py_BUILD_CORE define"
 #endif
 
-extern int _PyRun_SimpleFileObject(
+extern PyObject* _PyRun_SimpleFile(
     FILE *fp,
     PyObject *filename,
     int closeit,
     PyCompilerFlags *flags);
 
-extern int _PyRun_AnyFileObject(
+extern PyObject* _PyRun_AnyFile(
     FILE *fp,
     PyObject *filename,
     int closeit,
     PyCompilerFlags *flags);
 
-extern int _PyRun_InteractiveLoopObject(
-    FILE *fp,
-    PyObject *filename,
-    PyCompilerFlags *flags);
-
 extern int _PyObject_SupportedAsScript(PyObject *);
 extern const char* _Py_SourceAsString(
     PyObject *cmd,
@@ -33,12 +28,18 @@ extern const char* _Py_SourceAsString(
     PyCompilerFlags *cf,
     PyObject **cmd_copy);
 
-extern PyObject * _Py_CompileStringObjectWithModule(
+extern PyObject * _Py_CompileString(
     const char *str,
     PyObject *filename, int start,
     PyCompilerFlags *flags, int optimize,
     PyObject *module);
 
+// Export for special main.c string compiling with source tracebacks
+extern PyObject* _PyRun_SimpleString(
+    const char *command,
+    PyObject* name,
+    PyCompilerFlags *flags);
+
 
 /* Stack size, in "pointers". This must be large enough, so
  * no two calls to check recursion depth are more than this far

Lib/email/utils.py

@@ -317,10 +317,13 @@ def parsedate_to_datetime(data):
     if parsed_date_tz is None:
         raise ValueError('Invalid date value or format "%s"' % str(data))
     *dtuple, tz = parsed_date_tz
-    if tz is None:
-        return datetime.datetime(*dtuple[:6])
-    return datetime.datetime(*dtuple[:6],
-            tzinfo=datetime.timezone(datetime.timedelta(seconds=tz)))
+    try:
+        if tz is None:
+            return datetime.datetime(*dtuple[:6])
+        return datetime.datetime(*dtuple[:6],
+                tzinfo=datetime.timezone(datetime.timedelta(seconds=tz)))
+    except OverflowError as exc:
+        raise ValueError('Invalid date value or format "%s"' % str(data)) from exc
 
 
 def parseaddr(addr, *, strict=True):

Lib/imaplib.py

@@ -899,7 +899,7 @@ def select(self, mailbox='INBOX', readonly=False):
             if __debug__:
                 if self.debug >= 1:
                     self._dump_ur(self.untagged_responses)
-            raise self.readonly('%s is not writable' % mailbox)
+            raise self.readonly('%r is not writable' % (mailbox,))
         return typ, self.untagged_responses.get('EXISTS', [None])
 
 
@@ -1024,7 +1024,7 @@ def uid(self, command, *args):
         """
         command = command.upper()
         if not command in Commands:
-            raise self.error("Unknown IMAP4 UID command: %s" % command)
+            raise self.error("Unknown IMAP4 UID command: %r" % (command,))
         if self.state not in Commands[command]:
             raise self.error("command %s illegal in state %s, "
                              "only allowed in states %s" %