Twisted, deferred full trace

Question

I am just involved in writing Twisted applications and therefore make many mistakes.

Suppose the code exists:

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)

We have a bug in os.startfile (self.path) and Big Traceback:

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

If I uncomment # d.addErrback (self.command_die)

We have a little "log" create by print ('com_die', d):

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

Is there a way to get the full \ TraceBack log at design time?

At the moment, to understand where the new error was, addErrorback `s needs to be commented

Answer 1

Twisted Failure , . printTraceback():

>>> 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

http://twistedmatrix.com/trac/browser/tags/releases/twisted-8.2.0/twisted/python/failure.py#L121, .

PS: d , / - res/err ..