@Override
  public void invertElementInitializer(PsiElement psiElement) {
    if (psiElement instanceof PyNamedParameter) {
      final PyExpression defaultValue = ((PyNamedParameter)psiElement).getDefaultValue();
      if (defaultValue != null) {
        replaceWithNegatedExpression(defaultValue);
      }
    }
  }
@Override
  public void invertElementInitializer(PsiElement psiElement)