不能算出TypeError: __init__()只接受3个参数(2给出)

I am working on a multi clients/ server chat app that can write input from one client to multi clients. For the client side it's working well, yet for the server side I want to add a part where it can print out the input from the clients on its own screen as well. And when I am working on it I encounter the issue of init()takes exactly 3 arguements (2 given) with the line "self.app = app"

我正在开发一个多客户机/服务器聊天应用程序，可以从一个客户端到多个客户端编写输入。对于客户端来说，它运行得很好，但是对于服务器端，我想添加一个部分，它可以在自己的屏幕上打印出来自客户机的输入。当我在处理它的时候，我遇到了init()的问题，它正好带了3个论点(2给出)和“self”。应用=应用”

Here is my code

这是我的代码

import kivy
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.support import install_twisted_reactor
install_twisted_reactor()
from twisted.internet import reactor
from twisted.internet.protocol import Protocol, Factory

class MultiClientEcho(Protocol):

    def __init__(self, factory, app):
        self.factory = factory
        self.app = app

    def connectionMade(self):
        self.factory.clients.append(self)

    def dataReceived(self, data):
        for client in self.factory.clients:
             addtolog = self.factory.app.handle_message(data)
             if addtolog:
               client.transport.write(data)

    def connectionLost(self,reason):
        self.factory.clients.remove(self)

class MultiClientEchoFactory(Factory):
    protocol = MultiClientEcho
    def __init__(self):
        self.clients = []

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


class ServerApp(App):
    def build(self):
        self.label = Label(text="server started\n")
        reactor.listenTCP(8000, MultiClientEchoFactory())
        return self.label

    def handle_message(self, msg):
        self.label.text = "received:  %s\n" % msg
        return msg


if __name__ == '__main__':
    ServerApp().run()

The interesting thing is that I was just adapting from the source code from this site: http://kivy.org/docs/guide/other-frameworks.html , it was working well on its own as well, but once i changed the protocol to MultiClientEcho it immediately resulted in such type error. How can I fix this?

有趣的是，我刚刚从这个站点上修改了源代码:http://kivy.org/docs/guide/other-frameworks.html，它本身也运行良好，但是一旦我将协议更改为多列技术，它就会立即导致这种类型错误。我怎么解决这个问题?

3 个解决方案

#1

Look at the __init__ definition for MultiClientEchoFactory:

看看多中心工厂的__init__定义:

def __init__(self, factory, app):

That requires three parameters to function (or else it'll throw an error).

这需要三个参数来运行(否则会抛出一个错误)。

You call this line here:

你把这条线叫做

return MultiClientEcho(self)

Now, the self in __init__ will get defined automatically for you by this instance of MultiClientEcho. factory will get defined as your instance of MultiClientEchoFactory. However, you haven't passed in a parameter for app, so python cannot continue.

现在，在__init__中的self将通过这个多列技术的实例自动为您定义。工厂将被定义为你的多工厂的实例。但是，您还没有在应用程序中传递参数，因此python不能继续。

What you probably want to do is pass your instance of ServerApp in the build function into the constructor of MultiClientEchoFactory:

您可能想要做的是将构建函数中的ServerApp实例传递给multilientechofactory的构造函数:

    reactor.listenTCP(8000, MultiClientEchoFactory(self))

change the factory to be:

更改工厂为:

def __init__(self, app):
    self.app = app
    self.clients = []

def buildProtocol(self, addr):
        return MultiClientEcho(self, self.app)

which will get rid of this error as now you'll be supplying that third app parameter.

这将会消除这个错误现在你将提供第三个应用程序参数。

#2

you are calling MultiClientEcho(self) in class MultiClientEchoFactory with only one arguments,factory:

您在类多列的工厂中调用多列技术(self)，只有一个参数，工厂:

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

you should try something like

你应该试试。

class MultiClientEchoFactory(Factory):
    protocol = MultiClientEcho
    def __init__(self,app):
        self.clients = []
        self.app=app

    def buildProtocol(self, addr):
            return MultiClientEcho(self,app)


class ServerApp(App):
    def build(self):
        self.label = Label(text="server started\n")
        reactor.listenTCP(8000, MultiClientEchoFactory(self))
        return self.label

    def handle_message(self, msg):
        self.label.text = "received:  %s\n" % msg
        return msg


if __name__ == '__main__':
    ServerApp().run()

#3

The error message seems clear: MultiClientEcho's __init__ method expects three parameters (factory and app as well as the automatic self) but you're only passing self and factory when you instantiate it in the buildProtocol method . Where is it supposed to get app from?

错误信息似乎很清楚:多列技术的__init__方法需要三个参数(工厂和应用程序以及自动的self)，但是当你在buildProtocol方法中实例化它时，你只是在传递self和factory。它应该从哪里得到应用?

#1