I am trying to setup of jupyterhub testing environment on RHEL 6. I have 
compiled Python3.6 from source, created a virtualenv and used pip to 
install the latest jupyterhub packages:

pip install jupyter jupyterhub jupyterhub-dummyauthenticator 
jupyterhub-simplespawner

Using a barebones config file: jupyterhub_config.py:
c.JupyterHub.spawner_class = 'simplespawner.SimpleLocalProcessSpawner'
c.JupyterHub.authenticator_class = 'dummyauthenticator.DummyAuthenticator'

I get the following error:
$ jupyterhub
[snip out help information]
[C 2017-03-21 12:52:00.230 JupyterHub application:91] The 
'authenticator_class' trait of <jupyterhub.app.JupyterHub object at 
0x7fba6ec06898> instance must be a type, but 
'dummyauthenticator.DummyAuthenticator' could not be imported

I can import the module in a python session (and it is show that it imports 
from the virtualenv):
$ python
Python 3.6.0 (default, Mar 21 2017, 08:57:23)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-17)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import dummyauthenticator
>>> dummyauthenticator.__file__
'/home/portcon/.envs/kate/lib/python3.6/site-packages/dummyauthenticator/__init__.py'

Is there a change in the config layout for these parameters in the latest 
version? 

Thanks,
Spencer

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