Merge remote-tracking branch 'upstream/main' into codegen-reduce-repetition

Author: iritkatriel

Doc/library/pathlib.rst

@@ -133,11 +133,13 @@ we also call *flavours*:
       PureWindowsPath('c:/Program Files')
 
    Spurious slashes and single dots are collapsed, but double dots (``'..'``)
-   are not, since this would change the meaning of a path in the face of
-   symbolic links::
+   and leading double slashes (``'//'``) are not, since this would change the
+   meaning of a path for various reasons (e.g. symbolic links, UNC paths)::
 
       >>> PurePath('foo//bar')
       PurePosixPath('foo/bar')
+      >>> PurePath('//foo/bar')
+      PurePosixPath('//foo/bar')
       >>> PurePath('foo/./bar')
       PurePosixPath('foo/bar')
       >>> PurePath('foo/../bar')
@@ -166,13 +168,17 @@ we also call *flavours*:
 .. class:: PureWindowsPath(*pathsegments)
 
    A subclass of :class:`PurePath`, this path flavour represents Windows
-   filesystem paths::
+   filesystem paths, including `UNC paths`_::
 
       >>> PureWindowsPath('c:/Program Files/')
       PureWindowsPath('c:/Program Files')
+      >>> PureWindowsPath('//server/share/file')
+      PureWindowsPath('//server/share/file')
 
    *pathsegments* is specified similarly to :class:`PurePath`.
 
+   .. _unc paths: https://en.wikipedia.org/wiki/Path_(computing)#UNC
+
 Regardless of the system you're running on, you can instantiate all of
 these classes, since they don't provide any operation that does system calls.
 
@@ -309,6 +315,27 @@ Pure paths provide the following methods and properties:
       >>> PureWindowsPath('//host/share').root
       '\\'
 
+   If the path starts with more than two successive slashes,
+   :class:`~pathlib.PurePosixPath` collapses them::
+
+      >>> PurePosixPath('//etc').root
+      '//'
+      >>> PurePosixPath('///etc').root
+      '/'
+      >>> PurePosixPath('////etc').root
+      '/'
+
+   .. note::
+
+      This behavior conforms to *The Open Group Base Specifications Issue 6*,
+      paragraph `4.11 *Pathname Resolution* <xbd_path_resolution>`_:
+
+      *"A pathname that begins with two successive slashes may be interpreted in
+      an implementation-defined manner, although more than two leading slashes
+      shall be treated as a single slash."*
+
+   .. xbd_path_resolution: https://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap04.html#tag_04_11
+
 .. data:: PurePath.anchor
 
    The concatenation of the drive and root::

Doc/library/symtable.rst

@@ -69,7 +69,8 @@ Examining Symbol Tables
 
    .. method:: get_identifiers()
 
-      Return a list of names of symbols in this table.
+      Return a view object containing the names of symbols in the table.
+      See the :ref:`documentation of view objects <dict-views>`.
 
    .. method:: lookup(name)
 

Doc/tools/susp-ignored.csv

@@ -172,6 +172,8 @@ library/itertools,,:step,elements from seq[start:stop:step]
 library/itertools,,::,kernel = tuple(kernel)[::-1]
 library/itertools,,:stop,elements from seq[start:stop:step]
 library/logging.handlers,,:port,host:port
+library/logging,,:root,WARNING:root:Watch out!
+library/logging,,:Watch,WARNING:root:Watch out!
 library/mmap,,:i2,obj[i1:i2]
 library/multiprocessing,,`,# Add more tasks using `put()`
 library/multiprocessing,,:queue,">>> QueueManager.register('get_queue', callable=lambda:queue)"

Doc/whatsnew/3.11.rst

@@ -373,6 +373,9 @@ Other Language Changes
   the current directory, the script's directory or an empty string.
   (Contributed by Victor Stinner in :gh:`57684`.)
 
+* A ``"z"`` option was added to the format specification mini-language that
+  coerces negative zero to zero after rounding to the format precision.  See
+  :pep:`682` for more details.  (Contributed by John Belmonte in :gh:`90153`.)
 
 Other CPython Implementation Changes
 ====================================

Include/internal/pycore_global_strings.h

@@ -90,6 +90,7 @@ struct _Py_global_strings {
         STRUCT_FOR_ID(__delete__)
         STRUCT_FOR_ID(__delitem__)
         STRUCT_FOR_ID(__dict__)
+        STRUCT_FOR_ID(__dictoffset__)
         STRUCT_FOR_ID(__dir__)
         STRUCT_FOR_ID(__divmod__)
         STRUCT_FOR_ID(__doc__)
@@ -202,9 +203,11 @@ struct _Py_global_strings {
         STRUCT_FOR_ID(__truediv__)
         STRUCT_FOR_ID(__trunc__)
         STRUCT_FOR_ID(__typing_is_unpacked_typevartuple__)
+        STRUCT_FOR_ID(__typing_prepare_subst__)
         STRUCT_FOR_ID(__typing_subst__)
         STRUCT_FOR_ID(__typing_unpacked_tuple_args__)
         STRUCT_FOR_ID(__warningregistry__)
+        STRUCT_FOR_ID(__weaklistoffset__)
         STRUCT_FOR_ID(__weakref__)
         STRUCT_FOR_ID(__xor__)
         STRUCT_FOR_ID(_abc_impl)

Include/internal/pycore_runtime_init.h

@@ -712,6 +712,7 @@ extern "C" {
                 INIT_ID(__delete__), \
                 INIT_ID(__delitem__), \
                 INIT_ID(__dict__), \
+                INIT_ID(__dictoffset__), \
                 INIT_ID(__dir__), \
                 INIT_ID(__divmod__), \
                 INIT_ID(__doc__), \
@@ -824,9 +825,11 @@ extern "C" {
                 INIT_ID(__truediv__), \
                 INIT_ID(__trunc__), \
                 INIT_ID(__typing_is_unpacked_typevartuple__), \
+                INIT_ID(__typing_prepare_subst__), \
                 INIT_ID(__typing_subst__), \
                 INIT_ID(__typing_unpacked_tuple_args__), \
                 INIT_ID(__warningregistry__), \
+                INIT_ID(__weaklistoffset__), \
                 INIT_ID(__weakref__), \
                 INIT_ID(__xor__), \
                 INIT_ID(_abc_impl), \

Lib/importlib/_bootstrap_external.py

@@ -1399,7 +1399,9 @@ def invalidate_caches():
         """Call the invalidate_caches() method on all path entry finders
         stored in sys.path_importer_caches (where implemented)."""
         for name, finder in list(sys.path_importer_cache.items()):
-            if finder is None:
+            # Drop entry if finder name is a relative path. The current
+            # working directory may have changed.
+            if finder is None or not _path_isabs(name):
                 del sys.path_importer_cache[name]
             elif hasattr(finder, 'invalidate_caches'):
                 finder.invalidate_caches()
@@ -1567,9 +1569,12 @@ def __init__(self, path, *loader_details):
             loaders.extend((suffix, loader) for suffix in suffixes)
         self._loaders = loaders
         # Base (directory) path
-        self.path = path or '.'
-        if not _path_isabs(self.path):
-            self.path = _path_join(_os.getcwd(), self.path)
+        if not path or path == '.':
+            self.path = _os.getcwd()
+        elif not _path_isabs(path):
+            self.path = _path_join(_os.getcwd(), path)
+        else:
+            self.path = path
         self._path_mtime = -1
         self._path_cache = set()
         self._relaxed_path_cache = set()

Lib/symtable.py

@@ -111,7 +111,7 @@ def has_children(self):
         return bool(self._table.children)
 
     def get_identifiers(self):
-        """Return a list of names of symbols in the table.
+        """Return a view object containing the names of symbols in the table.
         """
         return self._table.symbols.keys()
 

Lib/test/pickletester.py

@@ -3035,6 +3035,67 @@ def check_array(arr):
         # 2-D, non-contiguous
         check_array(arr[::2])
 
+    def test_evil_class_mutating_dict(self):
+        # https://github.com/python/cpython/issues/92930
+        from random import getrandbits
+
+        global Bad
+        class Bad:
+            def __eq__(self, other):
+                return ENABLED
+            def __hash__(self):
+                return 42
+            def __reduce__(self):
+                if getrandbits(6) == 0:
+                    collection.clear()
+                return (Bad, ())
+
+        for proto in protocols:
+            for _ in range(20):
+                ENABLED = False
+                collection = {Bad(): Bad() for _ in range(20)}
+                for bad in collection:
+                    bad.bad = bad
+                    bad.collection = collection
+                ENABLED = True
+                try:
+                    data = self.dumps(collection, proto)
+                    self.loads(data)
+                except RuntimeError as e:
+                    expected = "changed size during iteration"
+                    self.assertIn(expected, str(e))
+
+    def test_evil_pickler_mutating_collection(self):
+        # https://github.com/python/cpython/issues/92930
+        if not hasattr(self, "pickler"):
+            raise self.skipTest(f"{type(self)} has no associated pickler type")
+
+        global Clearer
+        class Clearer:
+            pass
+
+        def check(collection):
+            class EvilPickler(self.pickler):
+                def persistent_id(self, obj):
+                    if isinstance(obj, Clearer):
+                        collection.clear()
+                    return None
+            pickler = EvilPickler(io.BytesIO(), proto)
+            try:
+                pickler.dump(collection)
+            except RuntimeError as e:
+                expected = "changed size during iteration"
+                self.assertIn(expected, str(e))
+
+        for proto in protocols:
+            check([Clearer()])
+            check([Clearer(), Clearer()])
+            check({Clearer()})
+            check({Clearer(), Clearer()})
+            check({Clearer(): 1})
+            check({Clearer(): 1, Clearer(): 2})
+            check({1: Clearer(), 2: Clearer()})
+
 
 class BigmemPickleTests:
 

Lib/test/test_import/__init__.py

@@ -927,15 +927,15 @@ def test_missing_source_legacy(self):
         m = __import__(TESTFN)
         try:
             self.assertEqual(m.__file__,
-                             os.path.join(os.getcwd(), os.curdir, os.path.relpath(pyc_file)))
+                             os.path.join(os.getcwd(), os.path.relpath(pyc_file)))
         finally:
             os.remove(pyc_file)
 
     def test___cached__(self):
         # Modules now also have an __cached__ that points to the pyc file.
         m = __import__(TESTFN)
         pyc_file = importlib.util.cache_from_source(TESTFN + '.py')
-        self.assertEqual(m.__cached__, os.path.join(os.getcwd(), os.curdir, pyc_file))
+        self.assertEqual(m.__cached__, os.path.join(os.getcwd(), pyc_file))
 
     @skip_if_dont_write_bytecode
     def test___cached___legacy_pyc(self):
@@ -951,7 +951,7 @@ def test___cached___legacy_pyc(self):
         importlib.invalidate_caches()
         m = __import__(TESTFN)
         self.assertEqual(m.__cached__,
-                         os.path.join(os.getcwd(), os.curdir, os.path.relpath(pyc_file)))
+                         os.path.join(os.getcwd(), os.path.relpath(pyc_file)))
 
     @skip_if_dont_write_bytecode
     def test_package___cached__(self):
@@ -971,10 +971,10 @@ def cleanup():
         m = __import__('pep3147.foo')
         init_pyc = importlib.util.cache_from_source(
             os.path.join('pep3147', '__init__.py'))
-        self.assertEqual(m.__cached__, os.path.join(os.getcwd(), os.curdir, init_pyc))
+        self.assertEqual(m.__cached__, os.path.join(os.getcwd(), init_pyc))
         foo_pyc = importlib.util.cache_from_source(os.path.join('pep3147', 'foo.py'))
         self.assertEqual(sys.modules['pep3147.foo'].__cached__,
-                         os.path.join(os.getcwd(), os.curdir, foo_pyc))
+                         os.path.join(os.getcwd(), foo_pyc))
 
     def test_package___cached___from_pyc(self):
         # Like test___cached__ but ensuring __cached__ when imported from a
@@ -998,10 +998,10 @@ def cleanup():
         m = __import__('pep3147.foo')
         init_pyc = importlib.util.cache_from_source(
             os.path.join('pep3147', '__init__.py'))
-        self.assertEqual(m.__cached__, os.path.join(os.getcwd(), os.curdir, init_pyc))
+        self.assertEqual(m.__cached__, os.path.join(os.getcwd(), init_pyc))
         foo_pyc = importlib.util.cache_from_source(os.path.join('pep3147', 'foo.py'))
         self.assertEqual(sys.modules['pep3147.foo'].__cached__,
-                         os.path.join(os.getcwd(), os.curdir, foo_pyc))
+                         os.path.join(os.getcwd(), foo_pyc))
 
     def test_recompute_pyc_same_second(self):
         # Even when the source file doesn't change timestamp, a change in