<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def retrieve_pool_stats(self, pool, **_params):
 """Retrieves stats for a certain load balancer pool."""

        return self.get(self.pool_path_stats % (pool), params=_params)