Fix #544: Port to Python 3.14

* _getattribute() API changed in Python 3.14.
* itertools.count() no longer supports pickle on Python 3.14:
  https://docs.python.org/dev/whatsnew/3.14.html#itertools
* Fix annotations test.

cloudpickle/cloudpickle.py

@@ -63,7 +63,7 @@
 import logging
 import opcode
 import pickle
-from pickle import _getattribute
+from pickle import _getattribute as _pickle_getattribute
 import platform
 import struct
 import sys
@@ -192,6 +192,14 @@ def _is_registered_pickle_by_value(module):
     return False
 
 
+if sys.version_info >= (3, 14):
+    def _getattribute(obj, name):
+        return _pickle_getattribute(obj, name.split('.'))
+else:
+    def _getattribute(obj, name):
+        return _pickle_getattribute(obj, name)[0]
+
+
 def _whichmodule(obj, name):
     """Find the module an object belongs to.
 
@@ -219,7 +227,7 @@ def _whichmodule(obj, name):
         ):
             continue
         try:
-            if _getattribute(module, name)[0] is obj:
+            if _getattribute(module, name) is obj:
                 return module_name
         except Exception:
             pass
@@ -293,7 +301,7 @@ def _lookup_module_and_qualname(obj, name=None):
         return None
 
     try:
-        obj2, parent = _getattribute(module, name)
+        obj2 = _getattribute(module, name)
     except AttributeError:
         # obj was not found inside the module it points to
         return None

tests/cloudpickle_test.py

@@ -2234,6 +2234,10 @@ def test_unhashable_function(self):
         self.assertEqual(depickled_method("a"), 1)
         self.assertEqual(depickled_method("b"), None)
 
+    @unittest.skipIf(
+        sys.version_info >= (3, 14),
+        "itertools.count() doesn't support pickle on Python 3.14+",
+    )
     def test_itertools_count(self):
         counter = itertools.count(1, step=2)
 
@@ -2278,11 +2282,9 @@ def g():
         self.assertEqual(f2.__doc__, f.__doc__)
 
     def test_wraps_preserves_function_annotations(self):
-        def f(x):
+        def f(x: int) -> float:
             pass
 
-        f.__annotations__ = {"x": 1, "return": float}
-
         @wraps(f)
         def g(x):
             f(x)