AttributeError: 'TerminalInteractiveShell' object has no attribute 'debugger_cls'

[happsky]

Traceback (most recent call last):
File "./discogan/image_translation.py", line 10, in
from model import *
File "/home/ii/DiscoGAN/discogan/model.py", line 6, in
import ipdb
File "/home/ii/anaconda2/lib/python2.7/site-packages/ipdb/init.py", line 7, in
from ipdb.main import set_trace, post_mortem, pm, run # noqa
File "/home/ii/anaconda2/lib/python2.7/site-packages/ipdb/main.py", line 32, in
debugger_cls = TerminalInteractiveShell().debugger_cls
AttributeError: 'TerminalInteractiveShell' object has no attribute 'debugger_cls'