Fix False positive on Enum.__members__.items() (#4135)

* Fix false positive on Enum.__members__.{values, keys}
* Fix False positive on Enum.__members__.items()

Co-authored-by: Marc Mueller <[email protected]>
Co-authored-by: Pierre Sassoulas <[email protected]>

ChangeLog

@@ -12,6 +12,9 @@ What's New in Pylint 2.7.2?
 ..
   Put bug fixes that will be cherry-picked to latest major version here
 
+* Fix False Positive on `Enum.__members__.items()`, `Enum.__members__.values`, and `Enum.__members__.keys`
+  Closes #4123
+
 
 What's New in Pylint 2.7.1?
 ===========================

pylint/checkers/typecheck.py

@@ -505,6 +505,18 @@ def _emit_no_member(node, owner, owner_name, ignored_mixins=True, ignored_none=T
                 return False
         except astroid.NotFoundError:
             return True
+    if (
+        owner.parent
+        and isinstance(owner.parent, astroid.ClassDef)
+        and owner.parent.name == "EnumMeta"
+        and owner_name == "__members__"
+        and node.attrname in ["items", "values", "keys"]
+    ):
+        print(node.attrname)
+        # Avoid false positive on Enum.__members__.{items(), values, keys}
+        # See https://github.com/PyCQA/pylint/issues/4123
+        return False
+
     return True
 
 

tests/functional/m/member_checks.py

@@ -217,3 +217,17 @@ def __init__(self, flag):
         else:
             self.attribute = []
             self.attribute.append(1)
+
+from enum import Enum
+class Animal(Enum):
+    ANT = 1
+    BEE = 2
+    CAT = 3
+    DOG = 4
+# To test false positive no-member on Enum.__members__.items()
+for itm in Animal.__members__.items():
+    print(itm)
+for keyy in Animal.__members__.keys:
+    print(keyy)
+for vall in Animal.__members__.values:
+    print(vall)