def command(self, cmd):

        # Test to see if there is a running command already
        if self._proc and self._proc.poll():
            raise error.InvalidCommand("Command already running")
        else:
            # Build the command.
            run_cmd = [self._gphoto2, '--port', self.port]
            run_cmd.extend(listify(cmd))

            self.logger.debug("gphoto2 command: {}".format(run_cmd))

            try:
                self._proc = subprocess.Popen(
                    run_cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, universal_newlines=True)
            except OSError as e:
                raise error.InvalidCommand("Can't send command to gphoto2. {} \t {}".format(e, run_cmd))
            except ValueError as e:
                raise error.InvalidCommand("Bad parameters to gphoto2. {} \t {}".format(e, run_cmd))
            except Exception as e:
                raise error.PanError(e)
Run gphoto2 command
dataset/ETHPy150Open panoptes/POCS/panoptes/camera/camera.py/AbstractGPhotoCamera.command