当调用socket.connect时出现TypeError（...）

Question

我在运行一个相对简单的TCP客户端时总是收到错误。麻烦的一行是对socket.connect（..）的调用，它通过TypeError进行查找。任何想法为什么？现在我已经为主机和端口输入了硬编码值。

Traceback (most recent call last): 
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/logging/__init__.py", line 846, in emit 
    msg = self.format(record) 
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/logging/__init__.py", line 723, in format 
    return fmt.format(record) 
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/logging/__init__.py", line 464, in format 
    record.message = record.getMessage() 
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/logging/__init__.py", line 328, in getMessage 
    msg = msg % self.args 
TypeError: not all arguments converted during string formatting 
Logged from file run_42bets.py, line 70 

# ------ 

#!/usr/bin/python 

import importlib 
import logging 
import optparse 
import os 
import socket 

SCRIPT_NAME = os.path.basename(__file__) 
VERSION = SCRIPT_NAME + ' 1.0' 

class TCPCommandSender: 
    """Wrapper around TCP client for sending commands""" 
    def __init__(self, host, port): 
     """Setup connection to host:port""" 
     logging.info("Connecting to server %s:%s", host, port) 

     self.__host = host 
     self.__port = port 

     self.__socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
     self.__socket.connect(("127.0.0.1", 2000)) 

    def __enter__(self): 
     """Return TCPCommandSender instance""" 
     return TCPCommandSender 

    def __exit__(self, type, value, traceback): 
     """Tear down connection if connected""" 
     if self.__socket: 
      logging.info("Disconnecting from server %s:%s", self.__host, self.__port) 
      self.__socket.close() 

    def send(self, cmd): 
     """Send admin command to server and return received message""" 
     try: 
      self.__socket.sendall(cmd) 
      return self.__socket.recv(1024) 
     except socket.error, msg: 
      logging.critical("Failed to send admin cmd; reason=%s", msg) 
      return "ERROR" 

def main(): 
    #customise logging 
    logging.basicConfig(filename=SCRIPT_NAME + '.log', 
         filemode='a', 
         format='%(asctime)s %(levelname)s %(message)s', 
         datefmt='%Y-%m-%d %H:%M:%S', 
         level=logging.INFO) 

    logging.info("Starting %s", SCRIPT_NAME) 

    #define command line arguments 
    parser = optparse.OptionParser("Usage: %prog [options]", version=VERSION) 
    parser.add_option('--host', dest='host', help='Server to send commands to', type='string') 
    parser.add_option('--port', dest='port', help='Server admin port to send commands to', type='int') 
    parser.add_option('--config', dest='config', help='Python configuration module to configure algo', metavar='FILE') 
    (options, args) = parser.parse_args() 

    #check we have all required command line arguments 
    if options.host and options.port and options.config: 
     try: 
      with TCPCommandSender(options.host, options.port) as cmd_sender: 
       try: 
        logging.info("Running configuration module %s", options.config) 
        logging.info("Finished configuration module %s", options.config) 
       except: 
        logging.critical("Error while running configuration module %s", options.config) 
     except EnvironmentError, msg: 
      logging.critical("Failed to connect to server %s:%s", options.host, options.port, msg) 
    else: 
     parser.error("Incorrect number/set of arguments provided, see --help") 

    logging.info("Ending %s", SCRIPT_NAME) 

if __name__ == "__main__": 
    main() 

Answer 1

你的问题是这样的一行：

logging.critical("Failed to connect to server %s:%s", options.host, options.port, msg) 

Python是抱怨，你给它三样东西装进字符串（options.host，options.port和msg），但只给了两个地方把它们（只有两个%s）。