[pull] main from python:main

Doc/library/venv.rst

@@ -407,6 +407,8 @@ creation according to their needs, the :class:`EnvBuilder` class.
 
         * ``lib_path`` - The purelib path for the virtual environment.
 
+        * ``platlib_path`` - The platlib path for the virtual environment.
+
         * ``bin_path`` - The script path for the virtual environment.
 
         * ``bin_name`` - The name of the script path relative to the virtual
@@ -431,6 +433,9 @@ creation according to their needs, the :class:`EnvBuilder` class.
            The attribute ``lib_path`` was added to the context, and the context
            object was documented.
 
+        .. versionchanged:: 3.15
+           The attribute ``platlib_path`` was added to the context.
+
     .. method:: create_configuration(context)
 
         Creates the ``pyvenv.cfg`` configuration file in the environment.

Doc/whatsnew/3.15.rst

@@ -601,6 +601,17 @@ unittest
   (Contributed by Garry Cairns in :gh:`134567`.)
 
 
+venv
+----
+
+* On POSIX platforms, platlib directories will be created if needed when
+  creating virtual environments, instead of using ``lib64 -> lib`` symlink.
+  This means purelib and platlib of virtual environments no longer share the
+  same ``lib`` directory on platforms where :data:`sys.platlibdir` is not
+  equal to ``lib``.
+  (Contributed by Rui Xi in :gh:`133951`.)
+
+
 xml.parsers.expat
 -----------------
 

Lib/test/test_traceback.py

@@ -5034,7 +5034,8 @@ def test_no_site_package_flavour(self):
 
         self.assertIn(
             (b"Site initialization is disabled, did you forget to "
-                b"add the site-packages directory to sys.path?"), stderr
+             b"add the site-packages directory to sys.path "
+             b"or to enable your virtual environment?"), stderr
         )
 
         code = """
@@ -5046,9 +5047,20 @@ def test_no_site_package_flavour(self):
 
         self.assertNotIn(
             (b"Site initialization is disabled, did you forget to "
-                b"add the site-packages directory to sys.path?"), stderr
+             b"add the site-packages directory to sys.path "
+             b"or to enable your virtual environment?"), stderr
         )
 
+    def test_missing_stdlib_package(self):
+        code = """
+            import sys
+            sys.stdlib_module_names |= {'spam'}
+            import spam
+        """
+        _, _, stderr = assert_python_failure('-S', '-c', code)
+
+        self.assertIn(b"Standard library module 'spam' was not found", stderr)
+
 
 class TestColorizedTraceback(unittest.TestCase):
     maxDiff = None

Lib/traceback.py

@@ -1107,11 +1107,14 @@ def __init__(self, exc_type, exc_value, exc_traceback, *, limit=None,
             suggestion = _compute_suggestion_error(exc_value, exc_traceback, wrong_name)
             if suggestion:
                 self._str += f". Did you mean: '{suggestion}'?"
-        elif exc_type and issubclass(exc_type, ModuleNotFoundError) and \
-                sys.flags.no_site and \
-                getattr(exc_value, "name", None) not in sys.stdlib_module_names:
-            self._str += (". Site initialization is disabled, did you forget to "
-                + "add the site-packages directory to sys.path?")
+        elif exc_type and issubclass(exc_type, ModuleNotFoundError):
+            module_name = getattr(exc_value, "name", None)
+            if module_name in sys.stdlib_module_names:
+                self._str = f"Standard library module '{module_name}' was not found"
+            elif sys.flags.no_site:
+                self._str += (". Site initialization is disabled, did you forget to "
+                    + "add the site-packages directory to sys.path "
+                    + "or to enable your virtual environment?")
         elif exc_type and issubclass(exc_type, (NameError, AttributeError)) and \
                 getattr(exc_value, "name", None) is not None:
             wrong_name = getattr(exc_value, "name", None)

Misc/NEWS.d/next/Core_and_Builtins/2025-10-21-09-20-03.gh-issue-140398.SoABwJ.rst

@@ -0,0 +1,4 @@
+Fix memory leaks in :mod:`readline` functions
+:func:`~readline.read_init_file`, :func:`~readline.read_history_file`,
+:func:`~readline.write_history_file`, and
+:func:`~readline.append_history_file` when :c:func:`PySys_Audit` fails.

Misc/NEWS.d/next/Library/2025-10-16-16-10-11.gh-issue-139707.zR6Qtn.rst

@@ -0,0 +1,2 @@
+Improve :exc:`ModuleNotFoundError` error message when a :term:`standard library`
+module is missing.

Modules/readline.c

@@ -255,6 +255,7 @@ readline_read_init_file_impl(PyObject *module, PyObject *filename_obj)
         if (!PyUnicode_FSConverter(filename_obj, &filename_bytes))
             return NULL;
         if (PySys_Audit("open", "OCi", filename_obj, 'r', 0) < 0) {
+            Py_DECREF(filename_bytes);
             return NULL;
         }
         errno = rl_read_init_file(PyBytes_AS_STRING(filename_bytes));
@@ -298,6 +299,7 @@ readline_read_history_file_impl(PyObject *module, PyObject *filename_obj)
         if (!PyUnicode_FSConverter(filename_obj, &filename_bytes))
             return NULL;
         if (PySys_Audit("open", "OCi", filename_obj, 'r', 0) < 0) {
+            Py_DECREF(filename_bytes);
             return NULL;
         }
         errno = read_history(PyBytes_AS_STRING(filename_bytes));
@@ -343,6 +345,7 @@ readline_write_history_file_impl(PyObject *module, PyObject *filename_obj)
             return NULL;
         filename = PyBytes_AS_STRING(filename_bytes);
         if (PySys_Audit("open", "OCi", filename_obj, 'w', 0) < 0) {
+            Py_DECREF(filename_bytes);
             return NULL;
         }
     } else {
@@ -400,6 +403,7 @@ readline_append_history_file_impl(PyObject *module, int nelements,
             return NULL;
         filename = PyBytes_AS_STRING(filename_bytes);
         if (PySys_Audit("open", "OCi", filename_obj, 'a', 0) < 0) {
+            Py_DECREF(filename_bytes);
             return NULL;
         }
     } else {