@Override
  public @Nullable Result calculateResult(Expression @NotNull [] params, ExpressionContext context) {
    if (context.getPsiElementAtStartOffset() != null) {
      if (LanguageLevel.forElement(context.getPsiElementAtStartOffset()).isPython2()) {
        final Result classNameResult = new PyClassNameMacro().calculateResult(new Expression[]{}, context);
        if (classNameResult != null) {
          final String className = classNameResult.toString();
          final String self = "self";
          return new TextResult(className + ", " + self);
        }
      }
    }
    return new TextResult("");
  }
@Override
  public @Nullable Result calculateResult(Expression @NotNull [] params, ExpressionContext context)