private static @Nullable PyStringLiteralExpression getStringLiteral(final @NotNull DataContext dataContext) {
    final Editor editor = CommonDataKeys.EDITOR.getData(dataContext);
    if (editor == null) {
      return null;
    }

    final PsiFile file = CommonDataKeys.PSI_FILE.getData(dataContext);
    if (file == null) {
      return null;
    }

    final PsiElement element = getElement(file, editor);
    if (element instanceof PyStringLiteralExpression) {
      return (PyStringLiteralExpression)element;
    }
    return null;
  }
private static @Nullable PyStringLiteralExpression getStringLiteral(final @NotNull DataContext dataContext)