def by_contact_id(self,contact_id: str) -> ContactItemRequestBuilder:
        """
        Provides operations to manage the contacts property of the microsoft.graph.contactFolder entity.
        param contact_id: The unique identifier of contact
        Returns: ContactItemRequestBuilder
        """
        if contact_id is None:
            raise TypeError("contact_id cannot be null.")
        from .item.contact_item_request_builder import ContactItemRequestBuilder

        url_tpl_params = get_path_parameters(self.path_parameters)
        url_tpl_params["contact%2Did"] = contact_id
        return ContactItemRequestBuilder(self.request_adapter, url_tpl_params)

        Provides operations to manage the contacts property of the microsoft.graph.contactFolder entity.
        param contact_id: The unique identifier of contact
        Returns: ContactItemRequestBuilder
        
msgraph/generated/users/item/contact_folders/item/contacts/contacts_request_builder.py