def by_post_id(self,post_id: str) -> PostItemRequestBuilder:
        """
        Provides operations to manage the posts property of the microsoft.graph.conversationThread entity.
        param post_id: The unique identifier of post
        Returns: PostItemRequestBuilder
        """
        if post_id is None:
            raise TypeError("post_id cannot be null.")
        from .item.post_item_request_builder import PostItemRequestBuilder

        url_tpl_params = get_path_parameters(self.path_parameters)
        url_tpl_params["post%2Did"] = post_id
        return PostItemRequestBuilder(self.request_adapter, url_tpl_params)

        Provides operations to manage the posts property of the microsoft.graph.conversationThread entity.
        param post_id: The unique identifier of post
        Returns: PostItemRequestBuilder
        
msgraph/generated/groups/item/conversations/item/threads/item/posts/posts_request_builder.py