<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def remove(self):
 """ Remove the PID file. """

        if isfile(self.pid_file):
            try:
                remove(self.pid_file)
            except Exception as e:
                self.die('Failed to remove PID file: {}'.format(str(e)))
        else:
            return True