<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_fw_policy(self, policy_id):
 """Return the firewall policy, given its ID. """

        policy = None
        try:
            policy = self.neutronclient.show_firewall_policy(policy_id)
        except Exception as exc:
            LOG.error("Failed to get firewall plcy for id %(id)s "
                      "Exc %(exc)s",
                      {'id': policy_id, 'exc': str(exc)})
        return policy