<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def policy_list(request, **kwargs):
 """List of QoS Policies."""

    policies = neutronclient(request).list_qos_policies(
        **kwargs).get('policies')
    return [QoSPolicy(p) for p in policies]