diff --git a/python/src/com/jetbrains/python/psi/impl/PyParameterListImpl.java b/python/src/com/jetbrains/python/psi/impl/PyParameterListImpl.java
index 11f2687145d7..841b7f5344c3 100644
--- a/python/src/com/jetbrains/python/psi/impl/PyParameterListImpl.java
+++ b/python/src/com/jetbrains/python/psi/impl/PyParameterListImpl.java
@@ -66,9 +66,12 @@ public class PyParameterListImpl extends PyBaseElementImpl<PyParameterListStub>
   public boolean isCompatibleTo(@NotNull PyParameterList other) {
     PyParameter[] params = getParameters();
     final PyParameter[] otherParams = other.getParameters();
+    final int optionalCount = optionalParametersCount(params);
+    final int otherOptionalCount = optionalParametersCount(otherParams);
+    final int requiredCount = params.length - optionalCount;
+    final int otherRequiredCount = otherParams.length - otherOptionalCount;
     if (hasPositionalContainer() || hasKeywordContainer()) {
-      // TODO: Check required arguments count of the current parameters list
-      return true;
+      return requiredCount <= otherRequiredCount;
     }
     final PyFunction otherFunction = other.getContainingFunction();
     final boolean otherHasArgs = other.hasPositionalContainer();
@@ -86,11 +89,7 @@ public class PyParameterListImpl extends PyBaseElementImpl<PyParameterListStub>
       }
       return otherParams.length == specialParamsCount;
     }
-    final int optionalCount = optionalParametersCount(params);
-    final int otherOptionalCount = optionalParametersCount(otherParams);
-    final int requiredCount = params.length - optionalCount;
-    final int otherRequiredCount = otherParams.length - otherOptionalCount;
-    return requiredCount <= otherRequiredCount && params.length >= otherRequiredCount && optionalCount >= otherOptionalCount;
+    return requiredCount <= otherRequiredCount && params.length >= otherParams.length && optionalCount >= otherOptionalCount;
   }
 
   private static int optionalParametersCount(@NotNull PyParameter[] parameters) {
diff --git a/python/src/com/jetbrains/python/refactoring/introduce/constant/PyIntroduceConstantHandler.java b/python/src/com/jetbrains/python/refactoring/introduce/constant/PyIntroduceConstantHandler.java
index 11fa090ef719..54358b4f87c8 100644
--- a/python/src/com/jetbrains/python/refactoring/introduce/constant/PyIntroduceConstantHandler.java
+++ b/python/src/com/jetbrains/python/refactoring/introduce/constant/PyIntroduceConstantHandler.java
@@ -1,6 +1,6 @@
 package com.jetbrains.python.refactoring.introduce.constant;
 
-import com.intellij.openapi.util.text.StringUtilRt;
+import com.intellij.openapi.util.text.StringUtil;
 import com.intellij.psi.PsiElement;
 import com.intellij.psi.util.PsiTreeUtil;
 import com.intellij.util.containers.HashSet;
@@ -45,7 +45,7 @@ public class PyIntroduceConstantHandler extends IntroduceHandler {
   protected Collection<String> generateSuggestedNames(@NotNull final PyExpression expression) {
     Collection<String> names = new HashSet<String>();
     for (String name : super.generateSuggestedNames(expression)) {
-      names.add(StringUtilRt.toUpperCase(name));
+      names.add(StringUtil.toUpperCase(name));
     }
     return names;
   }
diff --git a/python/testData/inspections/PyMethodOverridingInspection/test.py b/python/testData/inspections/PyMethodOverridingInspection/test.py
index dac942b2e6e9..23dfc147cecd 100644
--- a/python/testData/inspections/PyMethodOverridingInspection/test.py
+++ b/python/testData/inspections/PyMethodOverridingInspection/test.py
@@ -113,3 +113,23 @@ class c24:
 class c25(c24):
     def foo(self, arg1, arg2=None): #pass
         pass
+
+
+# PY-7162
+class c26:
+    def foo(self, arg1, arg2=None):
+        pass
+
+class c27(c26):
+    def foo<warning descr="Method signature does not match signature of base method">(self, arg1=None)</warning>: #fail
+        pass
+
+
+# PY-7159
+class c28:
+    def foo(self):
+        pass
+
+class c29(c28):
+    def foo<warning descr="Method signature does not match signature of base method">(self, p1, **kwargs)</warning>:  #fail
+        pass