<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def open_dut_connections(self):
 """ Opens connections to Duts. Starts Dut read threads. :return: Nothing :raises DutConnectionError: if problems were encountered while opening dut connection. """

        for dut in self.duts:
            try:
                dut.start_dut_thread()
                if hasattr(dut, "command"):
                    dut.open_dut(dut.command)
                else:
                    dut.open_dut()
            except DutConnectionError:
                self.logger.exception("Failed when opening dut connection")
                dut.close_dut(False)
                dut.close_connection()
                dut = None
                raise