helper.py 文件源码

def open(self, target):
    # target is a character device
    if os.path.exists(target) \
      and stat.S_ISCHR(os.stat(target).st_mode):
        self._file = os.open(target, os.O_RDWR)
    # treat target as ipv4 socket
    else: self._sock.connect((target, 9100))

  # close connection