Correct some types and guard against unexpected values in classes che…

…ckers

pylint/checkers/base.py

@@ -317,11 +317,10 @@ def _get_properties(config):
     return property_classes, property_names
 
 
-def _determine_function_name_type(node, config=None):
+def _determine_function_name_type(node: astroid.FunctionDef, config=None):
     """Determine the name type whose regex the a function's name should match.
 
     :param node: A function node.
-    :type node: astroid.node_classes.NodeNG
     :param config: Configuration from which to pull additional property classes.
     :type config: :class:`optparse.Values`
 
@@ -349,7 +348,11 @@ def _determine_function_name_type(node, config=None):
             and decorator.attrname in property_names
         ):
             inferred = utils.safe_infer(decorator)
-            if inferred and inferred.qname() in property_classes:
+            if (
+                inferred
+                and hasattr(inferred, "qname")
+                and inferred.qname() in property_classes
+            ):
                 return "attr"
     return "method"
 

pylint/checkers/classes.py

@@ -791,7 +791,7 @@ def _check_proper_bases(self, node):
         """
         for base in node.bases:
             ancestor = safe_infer(base)
-            if ancestor in (astroid.Uninferable, None):
+            if not ancestor:
                 continue
             if isinstance(ancestor, astroid.Instance) and ancestor.is_subtype_of(
                 "%s.type" % (BUILTINS,)

pylint/checkers/utils.py

@@ -776,7 +776,7 @@ def decorated_with(
 
 @lru_cache(maxsize=1024)
 def unimplemented_abstract_methods(
-    node: astroid.node_classes.NodeNG, is_abstract_cb: astroid.FunctionDef = None
+    node: astroid.ClassDef, is_abstract_cb: astroid.FunctionDef = None
 ) -> Dict[str, astroid.node_classes.NodeNG]:
     """
     Get the unimplemented abstract methods for the given *node*.