QtInProcessKernelManager.start_kernel fails on Python 3.8 #400
Description
The following example works with Python 3.7 but not 3.8, on Windows:
from qtconsole.inprocess import QtInProcessKernelManager
kernel_manager = QtInProcessKernelManager()
kernel_manager.start_kernel()With Python 3.8 I get:
Traceback (most recent call last):
File "C:\Users\Thomas Robitaille\.conda\envs\py38c\lib\site-packages\traitlets\traitlets.py", line 528, in get
value = obj._trait_values[self.name]
KeyError: 'iopub_socket'
During handling of the above exception, another exception occurred: Traceback (most recent call last):
File "C:\Users\Thomas Robitaille\.conda\envs\py38c\lib\site-packages\traitlets\traitlets.py", line 528, in get
value = obj._trait_values[self.name]
KeyError: 'iopub_thread'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "test_terminal.py", line 4, in <module> kernel_manager.start_kernel()
File "C:\Users\Thomas Robitaille\.conda\envs\py38c\lib\site-packages\ipykernel\inprocess\manager.py", line 46, in start_kernel
self.kernel = InProcessKernel(parent=self, session=self.session)
File "C:\Users\Thomas Robitaille\.conda\envs\py38c\lib\site-packages\ipykernel\inprocess\ipkernel.py", line 72, in __init__
super(InProcessKernel, self).__init__(**traits)
File "C:\Users\Thomas Robitaille\.conda\envs\py38c\lib\site-packages\ipykernel\ipkernel.py", line 71, in __init__
self.shell.displayhook.pub_socket = self.iopub_socket
File "C:\Users\Thomas Robitaille\.conda\envs\py38c\lib\site-packages\traitlets\traitlets.py", line 556, in __get__
return self.get(obj, cls)
File "C:\Users\Thomas Robitaille\.conda\envs\py38c\lib\site-packages\traitlets\traitlets.py", line 535, in get
value = self._validate(obj, dynamic_default())
File "C:\Users\Thomas Robitaille\.conda\envs\py38c\lib\site-packages\ipykernel\inprocess\ipkernel.py", line 67, in _default_iopub_socket
return self.iopub_thread.background_socket
File "C:\Users\Thomas Robitaille\.conda\envs\py38c\lib\site-packages\traitlets\traitlets.py", line 556, in __get__
return self.get(obj, cls)
File "C:\Users\Thomas Robitaille\.conda\envs\py38c\lib\site-packages\traitlets\traitlets.py", line 535, in get
value = self._validate(obj, dynamic_default())
File "C:\Users\Thomas Robitaille\.conda\envs\py38c\lib\site-packages\ipykernel\inprocess\ipkernel.py", line 59, in _default_iopub_thread
thread = IOPubThread(self._underlying_iopub_socket)
File "C:\Users\Thomas Robitaille\.conda\envs\py38c\lib\site-packages\ipykernel\iostream.py", line 71, in __init__
self._setup_event_pipe()
File "C:\Users\Thomas Robitaille\.conda\envs\py38c\lib\site-packages\ipykernel\iostream.py", line 90, in _setup_event_pipe
self._event_puller = ZMQStream(pipe_in, self.io_loop)
File "C:\Users\Thomas Robitaille\.conda\envs\py38c\lib\site-packages\zmq\eventloop\zmqstream.py", line 127, in __init__
self._init_io_state()
File "C:\Users\Thomas Robitaille\.conda\envs\py38c\lib\site-packages\zmq\eventloop\zmqstream.py", line 546, in _init_io_state
self.io_loop.add_handler(self.socket, self._handle_events, self.io_loop.READ)
File "C:\Users\Thomas Robitaille\.conda\envs\py38c\lib\site-packages\tornado\platform\asyncio.py", line 99, in add_handler
self.asyncio_loop.add_reader(fd, self._handle_events, fd, IOLoop.READ) File "C:\Users\Thomas Robitaille\.conda\envs\py38c\lib\asyncio\events.py", line 501, in add_reader
raise NotImplementedError
NotImplementedError
I made environments with e.g.:
conda create -n py38 python=3.8
conda activate py38
pip install qtpy pyqt5 qtconsole
and similarly for Python 3.7. The output of conda list for the failing environment is:
# packages in environment at C:\Users\Thomas Robitaille\.conda\envs\py38c:
#
# Name Version Build Channel
backcall 0.1.0 pypi_0 pypi
ca-certificates 2019.11.27 0
certifi 2019.11.28 py38_0
colorama 0.4.3 pypi_0 pypi
decorator 4.4.1 pypi_0 pypi
ipykernel 5.1.3 pypi_0 pypi
ipython 7.11.1 pypi_0 pypi
ipython-genutils 0.2.0 pypi_0 pypi
jedi 0.15.2 pypi_0 pypi
jupyter-client 5.3.4 pypi_0 pypi
jupyter-core 4.6.1 pypi_0 pypi
openssl 1.1.1d he774522_3
parso 0.5.2 pypi_0 pypi
pickleshare 0.7.5 pypi_0 pypi
pip 19.3.1 py38_0
prompt-toolkit 3.0.2 pypi_0 pypi
pygments 2.5.2 pypi_0 pypi
pyqt5 5.14.1 pypi_0 pypi
pyqt5-sip 12.7.0 pypi_0 pypi
python 3.8.0 hff0d562_2
python-dateutil 2.8.1 pypi_0 pypi
pywin32 227 pypi_0 pypi
pyzmq 18.1.1 pypi_0 pypi
qtconsole 4.6.0 pypi_0 pypi
qtpy 1.9.0 pypi_0 pypi
setuptools 44.0.0 py38_0
six 1.13.0 pypi_0 pypi
sqlite 3.30.1 he774522_0
tornado 6.0.3 pypi_0 pypi
traitlets 4.3.3 pypi_0 pypi
vc 14.1 h0510ff6_4
vs2015_runtime 14.16.27012 hf0eaf9b_1
wcwidth 0.1.8 pypi_0 pypi
wheel 0.33.6 py38_0
wincertstore 0.2 py38_0
Just to be clear, this is on Windows