Handle deprecated boolean cast of NotImplemented (#2831)

Author: zenlyj

ChangeLog

@@ -7,6 +7,8 @@ What's New in astroid 4.0.0?
 ============================
 Release date: TBA
 
+* Handle deprecated `bool(NotImplemented)` cast in const nodes.
+
 * Add support for boolean truthiness constraints (`x`, `not x`) in inference.
 
   Closes pylint-dev/pylint#9515

astroid/nodes/node_classes.py

@@ -19,7 +19,7 @@
 
 from astroid import decorators, protocols, util
 from astroid.bases import Instance, _infer_stmts
-from astroid.const import _EMPTY_OBJECT_MARKER, Context
+from astroid.const import _EMPTY_OBJECT_MARKER, PY314_PLUS, Context
 from astroid.context import CallContext, InferenceContext, copy_context
 from astroid.exceptions import (
     AstroidBuildingError,
@@ -2166,8 +2166,12 @@ def bool_value(self, context: InferenceContext | None = None):
         """Determine the boolean value of this node.
 
         :returns: The boolean value of this node.
-        :rtype: bool
+        :rtype: bool or Uninferable
         """
+        # bool(NotImplemented) is deprecated; it raises TypeError starting from Python 3.14
+        # and returns True for versions under 3.14
+        if self.value is NotImplemented:
+            return util.Uninferable if PY314_PLUS else True
         return bool(self.value)
 
     def _infer(

tests/test_inference.py

@@ -2984,6 +2984,14 @@ def __bool__(self):
         inferred = next(instance.infer())
         self.assertIs(inferred.bool_value(), util.Uninferable)
 
+    def test_bool_value_not_implemented(self) -> None:
+        node = extract_node("""NotImplemented""")
+        inferred = next(node.infer())
+        if PY314_PLUS:
+            self.assertIs(inferred.bool_value(), util.Uninferable)
+        else:
+            self.assertIs(inferred.bool_value(), True)
+
     def test_infer_coercion_rules_for_floats_complex(self) -> None:
         ast_nodes = extract_node(
             """