jupyter and ngsolve on windows

Stefan · May 5, 2019, 3:15pm

I am a terrible python novice but like jupyter a lot. Always working in an ubuntu virtual box was putting me off so I investigated how to get jupyter working on windows with NGSolve.
It took a while, but after finding:

github.com/ipython/ipykernel

Tk event loop not working on Windows

opened 11:33AM - 05 Oct 18 UTC

mhochsteger

Hi, There seems to be a problem with the event loop magic for Tk on Windows. … Executing `%gui tk` in the kernel results in: ``` ERROR:tornado.application:Exception in callback functools.partial(<function wrap.<locals>.null_wrapper at 0x000000000 Traceback (most recent call last): File "c:\program files\python37\lib\site-packages\tornado\ioloop.py", line 758, in _run_callback ret = callback() File "c:\program files\python37\lib\site-packages\tornado\stack_context.py", line 300, in null_wrapper return fn(*args, **kwargs) File "c:\program files\python37\lib\site-packages\ipykernel\kernelbase.py", line 295, in advance_eventloop eventloop(self) File "c:\program files\python37\lib\site-packages\ipykernel\eventloops.py", line 246, in loop_tk app.tk.createfilehandler(stream.getsockopt(zmq.FD), READABLE, notifier) AttributeError: '_tkinter.tkapp' object has no attribute 'createfilehandler' ``` Tested with - Windows 7 x64 - Python 3.7.0 x64 - ipykernel 5.0.0 ipykernel 4.10 works fine. Also commenting out line 246 in eventloops.py seems to work. Best, Matthias

and learning how to downgrade ipykernal to the last knwon good with
pip install ipykernel==4.10.0
it works.
Perhaps you can update the windows installation description or put a note under
https://ngsolve.org/docu/latest/install/usejupyter.html
untill this bug gets fixed.
Thanks,
Stefan

matthiash · May 6, 2019, 9:40am

Hi Stefan,

Thank you for the hint. Indeed we should have pointed that out in the documentation. I added a remark, which will appear in the nightly documentation tomorrow and in the next release.

Matthias