def by_content_type_id1(self,content_type_id1: str) -> ContentTypeItemRequestBuilder:
        """
        Provides operations to manage the baseTypes property of the microsoft.graph.contentType entity.
        param content_type_id1: The unique identifier of contentType
        Returns: ContentTypeItemRequestBuilder
        """
        if content_type_id1 is None:
            raise TypeError("content_type_id1 cannot be null.")
        from .item.content_type_item_request_builder import ContentTypeItemRequestBuilder

        url_tpl_params = get_path_parameters(self.path_parameters)
        url_tpl_params["contentType%2Did1"] = content_type_id1
        return ContentTypeItemRequestBuilder(self.request_adapter, url_tpl_params)

        Provides operations to manage the baseTypes property of the microsoft.graph.contentType entity.
        param content_type_id1: The unique identifier of contentType
        Returns: ContentTypeItemRequestBuilder
        
msgraph/generated/shares/item/list_/content_types/item/base_types/base_types_request_builder.py