Question

我正在学习Python Twisted，这是我的书中关于聊天服务器的例子：

project.with {
    plugins.withType(JavaPlugin) {
        //noinspection GroovyAssignabilityCheck
        configurations.all {
            resolutionStrategy {
                force localGroovy()
            }
        }
    }
}

我连接：telnet localhost 7100。它工作并问我：你的名字是什么？但是当我输入我的名字时，服务器会引发这个错误：

from twisted.internet.protocol import Factory
from twisted.protocols.basic import LineReceiver
from twisted.internet import reactor

class ChatProtocol(LineReceiver):
  def __init__(self, factory):
    self.factory = factory
    self.name = None
    self.state = "REGISTER"

  def connectionMade(self):
    self.sendLine("What's your name?")

  def connectionLost(self, reason):
    if self.name in self.factory.users:
        del self.factory.users[self.name]
        self.broadcastMessage("%s has left the channel !" %(self.name))

  def LineReceived(self, line):
    if self.state == "REGISTER" :
        self.handle_REGISTER(line)
    else:
        self.handle_CHAT(line)

  def handle_REGISTER(self, name):
    if name in self.factory.users:
        self.sendLine("Name taken, choose another!")
        return
    self.sendLine("Welcome, %s !" %(name))
    self.broadcastMessage("%s has joined channel!" %(name))
    self.name = name
    self.factory.users[name]= self
    self.state = "CHAT"

  def handle_CHAT(self, message):
    message = " <%s>  %s" %(self.name, message)
    self.broadcastMessage(message)

  def broadcastMessage(self, message):
    for name, protocol in self.factory.users.iteritems():
        if protocol != self:
            protocol.sendLine(message)

class ChatFactory(Factory):
  def __init__(self):
    self.users = {}

  def buildProtocol(self, addr):
    return ChatProtocol(self)

reactor.listenTCP(7100, ChatFactory())
reactor.run()

我对此非常陌生，所以我真的不太懂。

Answer 1

Python区分大小写。

你有：

  def LineReceived(self, line):
      ...

但你应该有：

  def lineReceived(self, line):
      ...

由于您定义的方法没有正确的名称，因此使用继承的方法。该方法的实现可以引发您所看到的异常。

此外，切换到使用四个空格缩进。它将提高可读性，它本质上是Python的标准。

聊天服务器与扭曲

1 个答案: