@Nullable
  private static PsiElement findPrecedingAnchorForAttributeDeclaration(@NotNull PyClass pyClass) {
    final PyStatement firstStatement = pyClass.getStatementList().getStatements()[0];
    final PyStringLiteralExpression classDocstring = pyClass.getDocStringExpression();
    if (firstStatement instanceof PyExpressionStatement && classDocstring == ((PyExpressionStatement)firstStatement).getExpression()) {
      return firstStatement;
    }
    return null;
  }
@Nullable
  private static PsiElement findPrecedingAnchorForAttributeDeclaration(@NotNull PyClass pyClass)