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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 appliance_device_snmp_v3_users(self):
 """ Gets the ApplianceDeviceSNMPv3Users API client. Returns: ApplianceDeviceSNMPv3Users: """

        if not self.__appliance_device_snmp_v3_users:
            self.__appliance_device_snmp_v3_users = ApplianceDeviceSNMPv3Users(self.__connection)
        return self.__appliance_device_snmp_v3_users