Error when adding ipdb.set_trace() inside tests

[montaro]

When I added;

import ipdb
ipdb.set_trace()

into a test case I get the following error:

(xyz-all)➜  xyz git:(xyz-61) ✗ ./manage.py test
nosetests --verbosity=1
Creating test database for alias 'default'...
...E..
======================================================================
ERROR: test_failing_get_or_create_group (zfsb_api.tests.aws.test_aws.TestAWSClient)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/arefaey/workspace/cloud9ers/xyz/xyz/xyz_api/tests/aws/test_aws.py", line 111, in test_failing_get_or_create_group
    ipdb.set_trace()
  File "/Users/arefaey/venvs/xyz-all/lib/python3.5/site-packages/ipdb/__main__.py", line 93, in set_trace
    p = _init_pdb(context).set_trace(frame)
  File "/Users/arefaey/venvs/xyz-all/lib/python3.5/site-packages/ipdb/__main__.py", line 76, in _init_pdb
    p = Pdb(def_colors)
  File "/Users/arefaey/venvs/xyz-all/lib/python3.5/site-packages/IPython/terminal/debugger.py", line 15, in __init__
    self.pt_init()
  File "/Users/arefaey/venvs/xyz-all/lib/python3.5/site-packages/IPython/terminal/debugger.py", line 38, in pt_init
    self.pt_cli = CommandLineInterface(self._pt_app, eventloop=self.shell._eventloop)
AttributeError: 'TerminalInteractiveShell' object has no attribute '_eventloop'

I guess this is related. gotcha/ipdb#105
The error happens when I use django-nose test runner and never happen when I use default django test runner. Any clues?

[JBKahn]

it has to do with the way nose fiddles with stdout by default, in the linked thread we discuss the use of nocapture (with nose) which would circumvent the bug in ipdb.

[jwhitlock]

Agreed, ./manage.py test -s or ./manage.py test --ipdb might help

[jwhitlock]

No response in a month, assuming that helped.

[zsoobhan]

I know i'm a bit late to the party but using the nose.tools debugger also circumvents the stdout issues.

from nose.tools import set_trace;set_trace()