<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def process_priority(self, process_priority):
 """ Sets the process priority. :param process_priority: string """


        log.info('QEMU VM "{name}" [{id}] has set the process priority to {priority}'.format(name=self._name,
                                                                                             id=self._id,
                                                                                             priority=process_priority))
        self._process_priority = process_priority