<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def power_devices(self):
 """ Gets the PowerDevices API client. Returns: PowerDevices: """

        if not self.__power_devices:
            self.__power_devices = PowerDevices(self.__connection)
        return self.__power_devices