Question

我正在学习在Twisted上编写应用程序，因此会犯很多错误。

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）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）

我们通过print（'com_die'，d）创建了很少的“log”：

('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？

目前我要了解哪里出现了新错误，有必要对addErrorback进行评论

Answer 1

Twisted Failure对象拥有您需要的一切。要获得良好的回溯，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

在源代码http://twistedmatrix.com/trac/browser/tags/releases/twisted-8.2.0/twisted/python/failure.py#L121中查找其他选项，它的评论非常好。

PS：名称 d 主要用于延迟本身，对于结果/错误，最好使用 res / err 等< / p>

扭曲，延迟完全追溯

1 个答案: