[pull] main from python:main

Lib/_pyrepl/_module_completer.py

@@ -42,11 +42,11 @@ def __init__(self, namespace: Mapping[str, Any] | None = None) -> None:
         self._global_cache: list[pkgutil.ModuleInfo] = []
         self._curr_sys_path: list[str] = sys.path[:]
 
-    def get_completions(self, line: str) -> list[str]:
+    def get_completions(self, line: str) -> list[str] | None:
         """Return the next possible import completions for 'line'."""
         result = ImportParser(line).parse()
         if not result:
-            return []
+            return None
         try:
             return self.complete(*result)
         except Exception:

Lib/_pyrepl/readline.py

@@ -134,7 +134,8 @@ def get_stem(self) -> str:
         return "".join(b[p + 1 : self.pos])
 
     def get_completions(self, stem: str) -> list[str]:
-        if module_completions := self.get_module_completions():
+        module_completions = self.get_module_completions()
+        if module_completions is not None:
             return module_completions
         if len(stem) == 0 and self.more_lines is not None:
             b = self.buffer
@@ -165,7 +166,7 @@ def get_completions(self, stem: str) -> list[str]:
             result.sort()
         return result
 
-    def get_module_completions(self) -> list[str]:
+    def get_module_completions(self) -> list[str] | None:
         line = self.get_line()
         return self.config.module_completer.get_completions(line)
 

Lib/email/_header_value_parser.py

@@ -1020,6 +1020,8 @@ def _get_ptext_to_endchars(value, endchars):
     a flag that is True iff there were any quoted printables decoded.
 
     """
+    if not value:
+        return '', '', False
     fragment, *remainder = _wsp_splitter(value, 1)
     vchars = []
     escape = False

Lib/test/test_email/test__header_value_parser.py

@@ -463,6 +463,19 @@ def test_get_qp_ctext_non_printables(self):
                                 [errors.NonPrintableDefect], ')')
         self.assertEqual(ptext.defects[0].non_printables[0], '\x00')
 
+    def test_get_qp_ctext_close_paren_only(self):
+        self._test_get_x(parser.get_qp_ctext,
+                        ')', '', ' ', [], ')')
+
+    def test_get_qp_ctext_open_paren_only(self):
+        self._test_get_x(parser.get_qp_ctext,
+                        '(', '', ' ', [], '(')
+
+    def test_get_qp_ctext_no_end_char(self):
+        self._test_get_x(parser.get_qp_ctext,
+                        '', '', ' ', [], '')
+
+
     # get_qcontent
 
     def test_get_qcontent_only(self):
@@ -503,6 +516,14 @@ def test_get_qcontent_non_printables(self):
                                 [errors.NonPrintableDefect], '"')
         self.assertEqual(ptext.defects[0].non_printables[0], '\x00')
 
+    def test_get_qcontent_empty(self):
+        self._test_get_x(parser.get_qcontent,
+                         '"', '', '', [], '"')
+
+    def test_get_qcontent_no_end_char(self):
+        self._test_get_x(parser.get_qcontent,
+                         '', '', '', [], '')
+
     # get_atext
 
     def test_get_atext_only(self):
@@ -1283,6 +1304,18 @@ def test_get_dtext_open_bracket_mid_word(self):
         self._test_get_x(parser.get_dtext,
                         'foo[bar', 'foo', 'foo', [], '[bar')
 
+    def test_get_dtext_open_bracket_only(self):
+        self._test_get_x(parser.get_dtext,
+                        '[', '', '', [], '[')
+
+    def test_get_dtext_close_bracket_only(self):
+        self._test_get_x(parser.get_dtext,
+                        ']', '', '', [], ']')
+
+    def test_get_dtext_empty(self):
+        self._test_get_x(parser.get_dtext,
+                        '', '', '', [], '')
+
     # get_domain_literal
 
     def test_get_domain_literal_only(self):

Lib/test/test_math.py

@@ -1214,6 +1214,12 @@ def testLdexp(self):
             self.assertEqual(math.ldexp(NINF, n), NINF)
             self.assertTrue(math.isnan(math.ldexp(NAN, n)))
 
+    @requires_IEEE_754
+    def testLdexp_denormal(self):
+        # Denormal output incorrectly rounded (truncated)
+        # on some Windows.
+        self.assertEqual(math.ldexp(6993274598585239, -1126), 1e-323)
+
     def testLog(self):
         self.assertRaises(TypeError, math.log)
         self.assertRaises(TypeError, math.log, 1, 2, 3)

Lib/test/test_pyrepl/test_pyrepl.py

@@ -918,7 +918,14 @@ def test_func(self):
 
 class TestPyReplModuleCompleter(TestCase):
     def setUp(self):
+        import importlib
+        # Make iter_modules() search only the standard library.
+        # This makes the test more reliable in case there are
+        # other user packages/scripts on PYTHONPATH which can
+        # interfere with the completions.
+        lib_path = os.path.dirname(importlib.__path__[0])
         self._saved_sys_path = sys.path
+        sys.path = [lib_path]
 
     def tearDown(self):
         sys.path = self._saved_sys_path
@@ -932,14 +939,6 @@ def prepare_reader(self, events, namespace):
         return reader
 
     def test_import_completions(self):
-        import importlib
-        # Make iter_modules() search only the standard library.
-        # This makes the test more reliable in case there are
-        # other user packages/scripts on PYTHONPATH which can
-        # intefere with the completions.
-        lib_path = os.path.dirname(importlib.__path__[0])
-        sys.path = [lib_path]
-
         cases = (
             ("import path\t\n", "import pathlib"),
             ("import importlib.\t\tres\t\n", "import importlib.resources"),
@@ -1052,6 +1051,19 @@ def test_invalid_identifiers(self):
                 output = reader.readline()
                 self.assertEqual(output, expected)
 
+    def test_no_fallback_on_regular_completion(self):
+        cases = (
+            ("import pri\t\n", "import pri"),
+            ("from pri\t\n", "from pri"),
+            ("from typing import Na\t\n", "from typing import Na"),
+        )
+        for code, expected in cases:
+            with self.subTest(code=code):
+                events = code_to_events(code)
+                reader = self.prepare_reader(events, namespace={})
+                output = reader.readline()
+                self.assertEqual(output, expected)
+
     def test_get_path_and_prefix(self):
         cases = (
             ('', ('', '')),

Misc/NEWS.d/next/Core_and_Builtins/2025-05-18-14-33-23.gh-issue-69605.ZMO49F.rst

@@ -0,0 +1,2 @@
+When auto-completing an import in the :term:`REPL`, finding no candidates
+now issues no suggestion, rather than suggestions from the current namespace.

Misc/NEWS.d/next/Library/2025-04-29-11-48-46.gh-issue-132876.lyTQGZ.rst

@@ -0,0 +1,4 @@
+``ldexp()`` on Windows doesn't round subnormal results before Windows 11,
+but should.  Python's :func:`math.ldexp` wrapper now does round them, so
+results may change slightly, in rare cases of very small results, on
+Windows versions before 11.

Misc/NEWS.d/next/Library/2025-05-19-10-32-11.gh-issue-134152.INJC2j.rst

@@ -0,0 +1,2 @@
+Fixed :exc:`UnboundLocalError` that could occur during :mod:`email` header
+parsing if an expected trailing delimiter is missing in some contexts.

Modules/mathmodule.c

@@ -2161,6 +2161,27 @@ math_ldexp_impl(PyObject *module, double x, PyObject *i)
     } else {
         errno = 0;
         r = ldexp(x, (int)exp);
+#ifdef _MSC_VER
+        if (DBL_MIN > r && r > -DBL_MIN) {
+            /* Denormal (or zero) results can be incorrectly rounded here (rather,
+               truncated).  Fixed in newer versions of the C runtime, included
+               with Windows 11. */
+            int original_exp;
+            frexp(x, &original_exp);
+            if (original_exp > DBL_MIN_EXP) {
+                /* Shift down to the smallest normal binade.  No bits lost. */
+                int shift = DBL_MIN_EXP - original_exp;
+                x = ldexp(x, shift);
+                exp -= shift;
+            }
+            /* Multiplying by 2**exp finishes the job, and the HW will round as
+               appropriate.  Note: if exp < -DBL_MANT_DIG, all of x is shifted
+               to be < 0.5ULP of smallest denorm, so should be thrown away.  If
+               exp is so very negative that ldexp underflows to 0, that's fine;
+               no need to check in advance. */
+            r = x*ldexp(1.0, (int)exp);
+        }
+#endif
         if (isinf(r))
             errno = ERANGE;
     }