Ignore cached_property in method-hidden check (pylint-dev#8753)

Author: kyoto7250

pylint/checkers/classes/class_checker.py

@@ -49,6 +49,7 @@
 _AccessNodes = Union[nodes.Attribute, nodes.AssignAttr]
 
 INVALID_BASE_CLASSES = {"bool", "range", "slice", "memoryview"}
+CACHED_PROPETIES = {"property", "cached_property"}
 BUILTIN_DECORATORS = {"builtins.property", "builtins.classmethod"}
 ASTROID_TYPE_COMPARATORS = {
     nodes.Const: lambda a, b: a.value == b.value,
@@ -1252,11 +1253,18 @@ def visit_functiondef(self, node: nodes.FunctionDef) -> None:
                     # attribute affectation will call this method, not hiding it
                     return
                 if isinstance(decorator, nodes.Name):
-                    if decorator.name == "property":
+                    if decorator.name in CACHED_PROPETIES:
                         # attribute affectation will either call a setter or raise
                         # an attribute error, anyway not hiding the function
                         return
 
+                if (
+                    isinstance(decorator, nodes.Attribute)
+                    and decorator.expr.name == "functools"
+                    and decorator.attrname == "cached_property"
+                ):
+                    return
+
                 # Infer the decorator and see if it returns something useful
                 inferred = safe_infer(decorator)
                 if not inferred:

tests/functional/m/method_hidden.py

@@ -2,6 +2,7 @@
 # pylint: disable=unused-private-member
 """check method hiding ancestor attribute
 """
+import functools
 
 
 class Abcd:
@@ -113,6 +114,12 @@ def _protected(self):  # [method-hidden]
         pass
 
 
+class CachedChild(Parent):
+    @functools.cached_property
+    def _protected(self):
+        pass
+
+
 class ParentTwo:
     def __init__(self):
         self.__private = None

tests/functional/m/method_hidden.txt

@@ -1,3 +1,3 @@
-method-hidden:17:4:17:12:Cdef.abcd:An attribute defined in functional.m.method_hidden line 11 hides this method:UNDEFINED
-method-hidden:85:4:85:11:One.one:An attribute defined in functional.m.method_hidden line 83 hides this method:UNDEFINED
-method-hidden:112:4:112:18:Child._protected:An attribute defined in functional.m.method_hidden line 108 hides this method:UNDEFINED
+method-hidden:18:4:18:12:Cdef.abcd:An attribute defined in functional.m.method_hidden line 12 hides this method:UNDEFINED
+method-hidden:86:4:86:11:One.one:An attribute defined in functional.m.method_hidden line 84 hides this method:UNDEFINED
+method-hidden:113:4:113:18:Child._protected:An attribute defined in functional.m.method_hidden line 109 hides this method:UNDEFINED