def by_article_id(self,article_id: str) -> ArticleItemRequestBuilder:
        """
        Provides operations to manage the articles property of the microsoft.graph.security.threatIntelligence entity.
        param article_id: The unique identifier of article
        Returns: ArticleItemRequestBuilder
        """
        if article_id is None:
            raise TypeError("article_id cannot be null.")
        from .item.article_item_request_builder import ArticleItemRequestBuilder

        url_tpl_params = get_path_parameters(self.path_parameters)
        url_tpl_params["article%2Did"] = article_id
        return ArticleItemRequestBuilder(self.request_adapter, url_tpl_params)

        Provides operations to manage the articles property of the microsoft.graph.security.threatIntelligence entity.
        param article_id: The unique identifier of article
        Returns: ArticleItemRequestBuilder
        
msgraph/generated/security/threat_intelligence/articles/articles_request_builder.py