Fix PY-16473 Inspection naming error for namedtuple declared into a function

python/src/com/jetbrains/python/inspections/PyPep8NamingInspection.java

@@ -25,6 +25,7 @@ import com.intellij.lang.ASTNode;
 import com.intellij.openapi.actionSystem.DataContext;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.ui.popup.PopupChooserBuilder;
+import com.intellij.openapi.util.Pair;
 import com.intellij.profile.codeInspection.InspectionProjectProfileManager;
 import com.intellij.psi.PsiElement;
 import com.intellij.psi.PsiElementVisitor;
@@ -115,18 +116,24 @@ public class PyPep8NamingInspection extends PyInspection {
       final PyFunction function = PsiTreeUtil.getParentOfType(node, PyFunction.class, true, PyClass.class);
       if (function == null) return;
       final Scope scope = ControlFlowCache.getScope(function);
-      for (PyExpression expression : node.getTargets()) {
-        final String name = expression.getName();
+      for (Pair<PyExpression, PyExpression> pair : node.getTargetsToValuesMapping()) {
+        final String name = pair.getFirst().getName();
         if (name == null || scope.isGlobal(name)) continue;
-        if (expression instanceof PyTargetExpression) {
-          final PyExpression qualifier = ((PyTargetExpression)expression).getQualifier();
+        if (pair.getFirst() instanceof PyTargetExpression) {
+          final PyExpression qualifier = ((PyTargetExpression)pair.getFirst()).getQualifier();
           if (qualifier != null) {
             return;
           }
         }
+        
+        final PyCallExpression assignedValue = PyUtil.as(pair.getSecond(), PyCallExpression.class);
+        if (assignedValue != null
+            && assignedValue.getCallee() != null && PyNames.NAMEDTUPLE.equals(assignedValue.getCallee().getName())) {
+          return;
+        }
         final String errorCode = "N806";
         if (!LOWERCASE_REGEX.matcher(name).matches() && !name.startsWith("_") && !ignoredErrors.contains(errorCode)) {
-          registerAndAddRenameAndIgnoreErrorQuickFixes(expression, errorCode);
+          registerAndAddRenameAndIgnoreErrorQuickFixes(pair.getFirst(), errorCode);
         }
       }
     }

python/testData/inspections/PyPep8NamingInspection/namedTupleInsideFunction.py

@@ -0,0 +1,5 @@
+from collections import namedtuple
+
+def f():
+    Point = namedtuple("Point", ["x1", "x2"], verbose=True)
+    <weak_warning descr="Variable in function should be lowercase">Test</weak_warning> = "foo"

python/testSrc/com/jetbrains/python/inspections/PyPep8NamingInspectionTest.java

@@ -112,6 +112,10 @@ public class PyPep8NamingInspectionTest extends PyTestCase {
     doTest();
   }
 
+  public void testNamedTupleInsideFunction() {
+    doTest();
+  }
+
   public void testOverrideFromModule() {
     myFixture.configureByFiles("inspections/PyPep8NamingInspection/" + getTestName(true) + ".py",
                                "inspections/PyPep8NamingInspection/tmp1.py");