5

我只是学习在 Twisted 上编写应用程序，所以犯了很多错误。

假设有一段代码：

d = defer.Deferred()
d.addCallback(self.start_app)
#d.addErrback(self.command_die)
d.callback(0)

def start_app(self, d):
    #import os
    return os.startfile(self.path)

def command_die(self, d):
    print ('com_die', d)

我们在 os.startfile(self.path) 和 Big Traceback 中有错误：

Unhandled error in Deferred:
Unhandled Error
Traceback (most recent call last):
  File "C:\Python27\lib\site-packages\twisted\internet\defer.py", line 542, in _runCallbacks
    current.result = callback(current.result, *args, **kw)
  File "C:/Dropbox/my_py/client3.py", line 100, in command_analiz
    d.callback(i)
  File "C:\Python27\lib\site-packages\twisted\internet\defer.py", line 361, in callback
    self._startRunCallbacks(result)
  File "C:\Python27\lib\site-packages\twisted\internet\defer.py", line 455, in _startRunCallbacks
    self._runCallbacks()
--- <exception caught here> ---
  File "C:\Python27\lib\site-packages\twisted\internet\defer.py", line 542, in _runCallbacks
    current.result = callback(current.result, *args, **kw)
  File "C:/Dropbox/my_py/client3.py", line 353, in start_eve_d
    return os.startfile(self.path)
exceptions.NameError: global name 'os' is not defined

如果我取消注释 #d.addErrback(self.command_die)

我们几乎没有通过 print ('com_die', d) 创建的“日志”：

('com_die', <twisted.python.failure.Failure <type 'exceptions.NameError'>>)

有没有办法在设计时获得完整的 Log \ TraceBack？

目前我要了解哪里有新的错误，有必要评论 addErrorback `s

4

1 回答 1

6

Twisted Failure 对象拥有你需要的一切。为了获得良好的回溯，请尝试使用printTraceback()方法：

>>> from twisted.internet.defer import Deferred as D
>>> def start_app(_):
...     #import os
...     return os.startfile('sasa')
... 
... def command_die(err):
...     err.printTraceback()
... 
...     
... d = D()
... d.addCallback(start_app)
... d.addErrback(command_die)
... d.callback(0)
Traceback (most recent call last):
  File "C:\Users\Pilyavskiy\AppData\Local\DreamPie\share\dreampie\subp-py2\dreampielib\subprocess\__init__.py", line 324, in execute
    exec codeob in self.locs
  File "<pyshell#3>", line 12, in <module>
    d.callback(0)
  File "C:\pill\Python27\lib\site-packages\twisted\internet\defer.py", line 361, in callback
    self._startRunCallbacks(result)
  File "C:\pill\Python27\lib\site-packages\twisted\internet\defer.py", line 455, in _startRunCallbacks
    self._runCallbacks()
--- <exception caught here> ---
  File "C:\pill\Python27\lib\site-packages\twisted\internet\defer.py", line 542, in _runCallbacks
    current.result = callback(current.result, *args, **kw)
  File "<pyshell#3>", line 3, in start_app
    return os.startfile('sasa')
exceptions.NameError: global name 'os' is not defined

在源http://twistedmatrix.com/trac/browser/tags/releases/twisted-8.2.0/twisted/python/failure.py#L121中寻找其他选项，它的评论很好。

PS: Name d is mostly used for deferred itself, for result/error it's better to use something like res/err etc

于 2011-09-01T07:01:33.597 回答