<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_students(self, **kwargs):
 """Get users by promotion id. :param int promotion: Promotion ID :return: JSON """


        _promotion_id = kwargs.get('promotion')
        _url = PROMOTION_URL.format(promo_id=_promotion_id)
        return self._request_api(url=_url).json()