Import CPython 3.14.6+ stable branch (2026-06-26)

Summary:
Imported python/cpython `3.14.6+` from upstream rev [`069c9c0`](https://www.github.com/python/cpython/commit/069c9c0af51839dfd17663d5834f492570cfee50) (committed 2026-06-26 23:28:56+00:00).

# Commit Info

- Base: (`3.14.6+`) - [`93ade5e`](https://www.github.com/python/cpython/commit/93ade5e38660f811b50d54e56c606076878f164c) (commit date: 2026-06-26 03:00:03+00:00)
- Imported: (`3.14.6+`) - [`069c9c0`](https://www.github.com/python/cpython/commit/069c9c0af51839dfd17663d5834f492570cfee50) (commit date: 2026-06-26 23:28:56+00:00)

# Noteworthy file changes

- Low-signal files (9 added) (NEWS.d, docs, .github)

Complete list of added/removed files: https://www.internalfb.com/intern/everpaste/?color=0&handle=GHGsEyZDg4R2jY0FAAnqYU2FLj9Rbr0LAAAz

Reviewed By: ambv

Differential Revision: D109935459

fbshipit-source-id: 9e39a2b17b3343b0896ec5ef070ee8763fdd74b4

Author: generatedunixname1734921407115435

Lib/idlelib/idle_test/htest.py

@@ -216,9 +216,9 @@
     'file': 'browser',
     'kwds': {},
     'msg': textwrap.dedent("""
-        "Inspect names of module, class(with superclass if applicable),
-        "methods and functions.  Toggle nested items.  Double clicking
-        "on items prints a traceback for an exception that is ignored.""")
+        Inspect names of module, class(with superclass if applicable),
+        methods and functions.  Toggle nested items.  Double clicking
+        on items prints a traceback for an exception that is ignored.""")
     }
 
 _multistatus_bar_spec = {

Lib/test/support/__init__.py

@@ -35,7 +35,7 @@
     "requires_gil_enabled", "requires_linux_version", "requires_mac_ver",
     "check_syntax_error",
     "requires_gzip", "requires_bz2", "requires_lzma", "requires_zstd",
-    "bigmemtest", "bigaddrspacetest", "cpython_only", "get_attribute",
+    "bigmemtest", "nomemtest", "bigaddrspacetest", "cpython_only", "get_attribute",
     "requires_IEEE_754", "requires_zlib",
     "has_fork_support", "requires_fork",
     "has_subprocess_support", "requires_subprocess",
@@ -1226,6 +1226,22 @@ def wrapper(self):
         return wrapper
     return decorator
 
+def nomemtest(f):
+    """Check that we can use this test with `_testcapi.set_nomemory`."""
+    from .import_helper import import_module
+
+    @functools.wraps(f)
+    def internal(*args, **kwargs):
+        import_module('_testcapi')
+        return f(*args, **kwargs)
+
+    return unittest.skipIf(
+        # Python built with Py_TRACE_REFS fail with a fatal error in
+        # _PyRefchain_Trace() on memory allocation error.
+        Py_TRACE_REFS,
+        'cannot test Py_TRACE_REFS build',
+    )(cpython_only(internal))
+
 def bigaddrspacetest(f):
     """Decorator for tests that fill the address space."""
     def wrapper(self):

Lib/test/test_atexit.py

@@ -135,9 +135,7 @@ def callback():
         self.assertEqual(os.read(r, len(expected)), expected)
         os.close(r)
 
-    # Python built with Py_TRACE_REFS fail with a fatal error in
-    # _PyRefchain_Trace() on memory allocation error.
-    @unittest.skipIf(support.Py_TRACE_REFS, 'cannot test Py_TRACE_REFS build')
+    @support.nomemtest
     def test_atexit_with_low_memory(self):
         # gh-140080: Test that setting low memory after registering an atexit
         # callback doesn't cause an infinite loop during finalization.

Lib/test/test_capi/test_mem.py

@@ -117,9 +117,7 @@ def test_pyobject_forbidden_bytes_is_freed(self):
     def test_pyobject_freed_is_freed(self):
         self.check_pyobject_is_freed('check_pyobject_freed_is_freed')
 
-    # Python built with Py_TRACE_REFS fail with a fatal error in
-    # _PyRefchain_Trace() on memory allocation error.
-    @unittest.skipIf(support.Py_TRACE_REFS, 'cannot test Py_TRACE_REFS build')
+    @support.nomemtest
     def test_set_nomemory(self):
         code = """if 1:
             import _testcapi

Lib/test/test_class.py

@@ -449,7 +449,6 @@ def __delattr__(self, *args):
 
     def testHasAttrString(self):
         import sys
-        from test.support import import_helper
         _testlimitedcapi = import_helper.import_module('_testlimitedcapi')
 
         class A:
@@ -1012,11 +1011,8 @@ class C:
         C.a = X()
         C.a = X()
 
-    @cpython_only
+    @support.nomemtest
     def test_detach_materialized_dict_no_memory(self):
-        # Skip test if _testcapi is not available:
-        import_helper.import_module('_testcapi')
-
         code = """if 1:
             import test.support
             import _testcapi

Lib/test/test_dtrace.py

@@ -13,6 +13,10 @@
 
 if not support.has_subprocess_support:
     raise unittest.SkipTest("test module requires subprocess")
+if not sysconfig.get_config_var('WITH_DTRACE'):
+    raise unittest.SkipTest(
+        "CPython must be configured with the --with-dtrace option."
+    )
 
 
 def abspath(filename):
@@ -178,12 +182,9 @@ class SystemTapOptimizedTests(TraceTests, unittest.TestCase):
 class CheckDtraceProbes(unittest.TestCase):
     @classmethod
     def setUpClass(cls):
-        if sysconfig.get_config_var('WITH_DTRACE'):
-            readelf_major_version, readelf_minor_version = cls.get_readelf_version()
-            if support.verbose:
-                print(f"readelf version: {readelf_major_version}.{readelf_minor_version}")
-        else:
-            raise unittest.SkipTest("CPython must be configured with the --with-dtrace option.")
+        readelf_major_version, readelf_minor_version = cls.get_readelf_version()
+        if support.verbose:
+            print(f"readelf version: {readelf_major_version}.{readelf_minor_version}")
 
 
     @staticmethod

Lib/test/test_exceptions.py

@@ -1575,11 +1575,7 @@ def recurse_in_body_and_except():
             sys.setrecursionlimit(recursionlimit)
 
 
-    @cpython_only
-    # Python built with Py_TRACE_REFS fail with a fatal error in
-    # _PyRefchain_Trace() on memory allocation error.
-    @unittest.skipIf(support.Py_TRACE_REFS, 'cannot test Py_TRACE_REFS build')
-    @unittest.skipIf(_testcapi is None, "requires _testcapi")
+    @support.nomemtest
     def test_recursion_normalizing_with_no_memory(self):
         # Issue #30697. Test that in the abort that occurs when there is no
         # memory left and the size of the Python frames stack is greater than
@@ -1766,11 +1762,7 @@ def test_unhandled(self):
                     self.assertIn("test message", report)
                 self.assertEndsWith(report, "\n")
 
-    @cpython_only
-    # Python built with Py_TRACE_REFS fail with a fatal error in
-    # _PyRefchain_Trace() on memory allocation error.
-    @unittest.skipIf(support.Py_TRACE_REFS, 'cannot test Py_TRACE_REFS build')
-    @unittest.skipIf(_testcapi is None, "requires _testcapi")
+    @support.nomemtest
     def test_memory_error_in_PyErr_PrintEx(self):
         code = """if 1:
             import _testcapi
@@ -1928,12 +1920,8 @@ def test_keyerror_context(self):
             exc2 = None
 
 
-    @cpython_only
-    # Python built with Py_TRACE_REFS fail with a fatal error in
-    # _PyRefchain_Trace() on memory allocation error.
-    @unittest.skipIf(support.Py_TRACE_REFS, 'cannot test Py_TRACE_REFS build')
+    @support.nomemtest
     def test_exec_set_nomemory_hang(self):
-        import_module("_testcapi")
         # gh-134163: A MemoryError inside code that was wrapped by a try/except
         # block would lead to an infinite loop.
 

Lib/test/test_interpreters/test_stress.py

@@ -5,7 +5,7 @@
 from test.support import import_helper
 from test.support import threading_helper
 # Raise SkipTest if subinterpreters not supported.
-import_helper.import_module('_interpreters')
+_interpreters = import_helper.import_module('_interpreters')
 from concurrent import interpreters
 from concurrent.interpreters import InterpreterError
 from .utils import TestBase
@@ -75,12 +75,13 @@ def run():
             start.set()
         support.gc_collect()
 
+    @support.nomemtest
     def test_create_interpreter_no_memory(self):
-        import _interpreters
-        _testcapi = import_helper.import_module("_testcapi")
+        import _testcapi
 
-        with self.assertRaises(InterpreterError):
-            _testcapi.set_nomemory(0, 1)
+        assertion = self.assertRaises(InterpreterError)
+        _testcapi.set_nomemory(0, 1)
+        with assertion:
             _interpreters.create()
 
 

Lib/test/test_json/test_fail.py

@@ -144,6 +144,13 @@ def test_truncated_input(self):
             ('"', 'Unterminated string starting at', 0),
             ('"spam', 'Unterminated string starting at', 0),
         ]
+        # A complete \uXXXX escape at end of input leaves it unterminated.
+        test_cases += [
+            (r'"\u0041', 'Unterminated string starting at', 0),
+            (r'"\ud834', 'Unterminated string starting at', 0),
+            (r'"\ud834\udd1e', 'Unterminated string starting at', 0),
+            (r'{"a": "\u0041', 'Unterminated string starting at', 6),
+        ]
         for data, msg, idx in test_cases:
             with self.assertRaises(self.JSONDecodeError) as cm:
                 self.loads(data)

Lib/test/test_json/test_scanstring.py

@@ -137,6 +137,9 @@ def test_bad_escapes(self):
             '"\\ud834\\u-123"',
             '"\\ud834\\u+123"',
             '"\\ud834\\u1_23"',
+            # Truncated or non-hex \uXXXX escape at end of input.
+            '"\\u004',
+            '"\\uXYZW',
         ]
         for s in bad_escapes:
             with self.assertRaises(self.JSONDecodeError, msg=s):