扭曲的，延迟的完全回溯

问题描述：

我只是学习在Twisted上编写应用程序，所以犯了很多错误。扭曲的，延迟的完全回溯

假设有一个代码：

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）错误和大回溯：

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＃d.addErrback（自我。 command_die）

我们有一点 “登录” 通过印刷（ 'com_die' 创建，d）：

('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？

此刻我明白，那里有一个新的错误，有必要作出评论addErrorback单曲

答

扭转失败对象有你需要的一切。为了得到很好的回溯尝试使用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

寻找它漂亮的很好的注释源http://twistedmatrix.com/trac/browser/tags/releases/twisted-8.2.0/twisted/python/failure.py#L121其他选项。

PS：名称d主要用于延期本身，结果/错误，最好使用像RES /犯错等

扭曲的，延迟的完全回溯

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