在两种不同的方法

Question

使用单一的telnet会话，我需要在下面这段代码使用telnet会话，如：

class ModTelnet(MXComm): 
def __init__(self): 
    MXComm.__init__(self) 

def _connect(self): 
    #connect to telnet session @ localhost port 4444 
    try: 
     HOST = "localhost" 
     port = "4444" 
    # tn = telnetlib.Telnet(HOST, port) 
     tn.open(HOST, port) 
    except: 
     print "Connection refused" 


def _receive(self): 
    #receive data (= msg) from telnet stdout 
    try: 
     data = tn.read_all() 
     return data 
    except tn.eof.ERR as ex: 
     if 'timeout error' not in ex.args[0]: 
      print 'Connection error:', ex 
      raise Disconnected() 

def _send(self, data): 
    #send command to telnet session 
    try:   
     tn.write(data + "\n") 
    except tn.socket.error as ex: 
     if 'timeout error' not in ex.args[0]: 
      print 'Connection error:', ex 
      raise Disconnected() 

这里ISE错误提出：

QApplication: Invalid Display* argument 
Connection refused 
Exception in thread Thread-1: 
Traceback (most recent call last): 
    File "/usr/lib/python2.6/threading.py", line 532, in __bootstrap_inner 
    self.run() 
    File "/home/mk3/MODiMX27/PELM_Gui/src/modimx.py", line 188, in run 
    self._conn.try_get_data() 
    File "/home/mk3/MODiMX27/PELM_Gui/src/modimx.py", line 58, in try_get_data 
    rx_item = self._receive() 
    File "/home/mk3/MODiMX27/PELM_Gui/src/modimx.py", line 112, in _receive 
    except tn.eof.ERR as ex: 

NameError: global name 'tn' is not defined 

的问题是，它似乎无法识别在我的第一个方法“连接”中打开的telnet会话......我们如何以最佳方式做到这一点？

Answer 1

tn应该self.tn以便其他方法可以访问它