Mark the community for deletion.

        :param delete_time: DateTime after which to delete the community.
        :type delete_time: datetime.datetime
        :raises: CommunitiesError

def delete(self):
        """Mark the community for deletion.

        :param delete_time: DateTime after which to delete the community.
        :type delete_time: datetime.datetime
        :raises: CommunitiesError
        """
        if self.deleted_at is not None:
            raise CommunitiesError(community=self)
        else:
            self.deleted_at = datetime.utcnow()