@Nullable
 protected PsiElement replaceExpression(
     PsiElement expression, PyExpression newExpression, IntroduceOperation operation) {
   PyExpressionStatement statement =
       PsiTreeUtil.getParentOfType(expression, PyExpressionStatement.class);
   if (statement != null) {
     if (statement.getExpression() == expression
         && expression.getUserData(PyReplaceExpressionUtil.SELECTION_BREAKS_AST_NODE) == null) {
       statement.delete();
       return null;
     }
   }
   return PyReplaceExpressionUtil.replaceExpression(expression, newExpression);
 }