@Nullable
  public static String getDefaultValueText(@Nullable PyAstExpression defaultValue) {
    if (defaultValue instanceof PyAstStringLiteralExpression) {
      final Pair<String, String> quotes = PyStringLiteralCoreUtil.getQuotes(defaultValue.getText());
      if (quotes != null) {
        return quotes.getFirst() + ((PyAstStringLiteralExpression)defaultValue).getStringValue() + quotes.getSecond();
      }
    }

    return defaultValue == null ? null : defaultValue.getText();
  }
@Nullable
  public static String getDefaultValueText(@Nullable PyAstExpression defaultValue)