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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_policies(self):
 """Returns all the Policies under the Identity namespace. Returns: (list):
 A list containing all the Policies under the Identity namespace. """


        prefix = _IDENTITY_NS + _POLICY_NS
        policylist_list = [
            _create_from_bytes(d, identity_pb2.PolicyList)
            for _, d in self._state_view.leaves(prefix=prefix)
        ]
        policies = []
        for policy_list in policylist_list:
            for policy in policy_list.policies:
                policies.append(policy)
        return sorted(policies, key=lambda p: p.name)