@Nullable
  private static PyExpression getFieldsArgumentValue(@NotNull PyCallExpression callExpression, @NotNull String possibleKeyword) {
    return PyPsiUtils.flattenParens(callExpression.getArgument(1, possibleKeyword, PyExpression.class));
  }
@Nullable
  private static PyExpression getFieldsArgumentValue(@NotNull PyCallExpression callExpression, @NotNull String possibleKeyword)