code: def is_running(self):
          
          pid = self.get_pid()
          if pid is None:
              return False
          # The PID file may still exist even if the daemon isn't running,
          # for example if it has crashed.
          try:
              os.kill(pid, 0)
          except OSError as e:
              if e.errno == errno.ESRCH:
                  # In this case the PID file shouldn't have existed in
                  # the first place, so we remove it
                  self.pid_file.release()
                  return False
              # We may also get an exception if we're not allowed to use
              # kill on the process, but that means that the process does
              # exist, which is all we care about here.
          return True
docs: Check if the daemon is running.