(self)
set self.stopped, which will cause polling to stop after next run
set self.stopped, which will cause polling to stop after next run
set self . stopped which will cause polling to stop after next run
def stop(self):
        """set self.stopped, which will cause polling to stop after next run"""
        if not self.stopped:
            self.stopped = True
def stop ( self ) : if not self . stopped : self . stopped = True