def delete_user_batch(self, num):
        """删除IM用户[批量]
        """

        if isinstance(num, int):
            url = ('/%s/%s/users?limit=%s' % (self.org, self.app, num))
            return http_delete(url, self.auth)
        else:
            print('wrong type of num, it should be int')
    def delete_friend(self, username, friend):
        """解除好友关系
        """

        url = ('/%s/%s/users/%s/contacts/users/%s' % (self.org, self.app, username, friend))
        return http_delete(url, self.auth)
    def remove_user_from_group(self, group_id, username):
        """群组减人
        """

        url = ('/%s/%s/chatgroups/%s/users/%s' % (self.org, self.app, group_id, username))
        return http_delete(url)
    def delete_user_by_username(self, username):
        """删除IM用户[单个]
        """

        url = ('/%s/%s/users/%s' % (self.org, self.app, username))
        return http_delete(url, self.auth)
    def delete_groups_by_id(self, group_id):
        """删除群组
        """

        url = ('/%s/%s/chatgroups/%s' % (self.org, self.app, group_id))
        return http_delete(url, self.auth)