Python 具有独立数据的回调链,与该链无关
我试图在twisted中执行一个简单的回调序列。我的想法是登录到一个服务,当登录成功后,我开始发送命令。这是我的代码:Python 具有独立数据的回调链,与该链无关,python,twisted,Python,Twisted,我试图在twisted中执行一个简单的回调序列。我的想法是登录到一个服务,当登录成功后,我开始发送命令。这是我的代码: from twisted.internet import reactor, defer class MyService: def __init__ (self): self.handle = None def login(self): def onConnect(handle):
from twisted.internet import reactor, defer
class MyService:
def __init__ (self):
self.handle = None
def login(self):
def onConnect(handle):
self.handle = handle
return
df = defer.Deferred().addCallback(onConnect)
reactor.callLater(2, df.callback, "dummyhandle")
return df
def sendCommand(self, command):
def onResult(result):
print result
return result
if self.handle == None:
print "Not logged in"
return
else:
df = defer.Deferred().addCallback(onResult, result ="xxx")
return df
my = MyService ()
my.login().addCallback(my.sendCommand, command = "format")
reactor.run()
运行该代码将生成以下stacktrace:
Unhandled error in Deferred: Traceback (most recent call last): File "/usr/lib/python2.6/dist-packages/twisted/internet/base.py", line 1179, in mainLoop
self.runUntilCurrent() File "/usr/lib/python2.6/dist-packages/twisted/internet/base.py", line 778, in runUntilCurrent
call.func(*call.args, **call.kw) File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 280, in callback
self._startRunCallbacks(result) File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 354, in _startRunCallbacks
self._runCallbacks()
--- <exception caught here> --- File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 371, in _runCallbacks
self.result = callback(self.result, *args, **kw) exceptions.TypeError: sendCommand() got multiple values for keyword argument 'command'
延迟:回溯(最后一次调用):文件“/usr/lib/python2.6/dist packages/twisted/internet/base.py”,第1179行,mainLoop中未处理的错误
self.rununtlcurrent()文件“/usr/lib/python2.6/dist packages/twisted/internet/base.py”,第778行,在rununtlcurrent中
call.func(*call.args,**call.kw)文件“/usr/lib/python2.6/dist packages/twisted/internet/defer.py”,第280行,在callback中
self._startRunCallbacks(结果)文件“/usr/lib/python2.6/dist packages/twisted/internet/defer.py”,第354行,在_startRunCallbacks中
self.\u runCallbacks()
------文件“/usr/lib/python2.6/dist-packages/twisted/internet/defer.py”,第371行,在runCallbacks中
self.result=回调(self.result,*args,**kw)异常。TypeError:sendCommand()为关键字参数“command”获取了多个值
这里重要的是sendCommand不需要登录的结果,而是需要不同的数据。它需要登录已经完成(这就是为什么我希望它在回调链中),但它对登录的结果不感兴趣(只要它不是一个错误,无论如何都会在错误链中处理)
我在这里做错了什么?很简单,处理程序的第一个参数必须是result:
def sendCommand(self, in_result, command):
do_the_stuff