Fix highlighting method that overrides final method without qualified name (PEP 591) (PY-34945)

GitOrigin-RevId: c7f0b0fdb0472850bfdd6d768fbad3a935cc3e6a

python/src/com/jetbrains/python/inspections/PyFinalInspection.kt

@@ -67,9 +67,12 @@ class PyFinalInspection : PyInspection() {
       if (cls != null) {
         PySuperMethodsSearch
           .search(node, myTypeEvalContext)
-          .firstOrNull { it is PyFunction && isFinal(it) }
+          .asSequence()
+          .filterIsInstance<PyFunction>()
+          .firstOrNull { isFinal(it) }
           ?.let {
-            registerProblem(node.nameIdentifier, "'${(it as PyFunction).qualifiedName}' is marked as '@final' and should not be overridden")
+            val qualifiedName = it.qualifiedName ?: it.containingClass?.name + "." + it.name
+            registerProblem(node.nameIdentifier, "'$qualifiedName' is marked as '@final' and should not be overridden")
           }
 
         if (!PyiUtil.isInsideStub(node)) {

python/testSrc/com/jetbrains/python/inspections/PyFinalInspectionTest.java

@@ -59,6 +59,21 @@ public class PyFinalInspectionTest extends PyInspectionTestCase {
                  "        pass");
   }
 
+  // PY-34945
+  public void testOverridingFinalMethodWithoutQualifiedName() {
+    doTestByText("from typing_extensions import final\n" +
+                 "def output():\n" +
+                 "    class Output:\n" +
+                 "        @final\n" +
+                 "        def foo(self):\n" +
+                 "            pass\n" +
+                 "    return Output\n" +
+                 "r = output()\n" +
+                 "class SubClass(r):\n" +
+                 "    def <warning descr=\"'Output.foo' is marked as '@final' and should not be overridden\">foo</warning>(self):\n" +
+                 "        pass");
+  }
+
   // PY-34945
   public void testOverridingOverloadedFinalMethod() {
     doMultiFileTest();