Not working on Windows: "ImportError: cannot import name 'ON_POSIX'"

[mjbright]

Running on Windows 7:

• Python 3.5.1 :: Anaconda 4.0.0 (64-bit)

I installed using

• pip install xonsh_kernel
  

• python -m xonsh_kernel.install
  

On starting a notebook from the Jupyter dashboard as "New -> Calysto Xonsh" the kernel dies repeatedly (immediately).

The jupyter console log shows:

[I 19:37:48.022 NotebookApp] Kernel started: 672f7917-b2a4-407a-8e5b-a6e509521df1
Traceback (most recent call last):
File "C:\Progs\Anaconda3\lib\runpy.py", line 170, in run_module_as_main
"main", mod_spec)
File "C:\Progs\Anaconda3\lib\runpy.py", line 85, in run_code
exec(code, run_globals)
File "C:\Progs\Anaconda3\lib\site-packages\xonsh_kernel__main.py", line 6, in
from .kernel import XonshKernel
File "C:\Progs\Anaconda3\lib\site-packages\xonsh_kernel\kernel.py", line 10, in
from xonsh.tools import redirect_stdout, redirect_stderr, swap, ON_POSIX
ImportError: cannot import name 'ON_POSIX'