Proactor event loop warning

[ryandvmartin]

Question about a warning I see when running notebooks through nbconvert on windows. Creating a basic environment:

mamba create --name jl python=3.10 jupyter

Then running a notebook through nbconvert, I get a warning:

❯ jupyter nbconvert --to html --execute .\Untitled.ipynb
[NbConvertApp] Converting notebook .\Untitled.ipynb to html
C:\Users\user\python\envs\jl\lib\site-packages\zmq\_future.py:724: RuntimeWarning: Proactor event loop does not implement add_reader family of methods required for zmq. Registering an additional selector thread for add_reader support via tornado. Use `asyncio.set_event_loop_policy(WindowsSelectorEventLoopPolicy())` to avoid this warning.
  self._get_loop()
[NbConvertApp] Writing 271060 bytes to Untitled.html

The warning goes away if I pin jupyter_core<5.7

Is there something in the setup I am missing for windows that would avoid the warning using the latest jupyter_core?

Thanks!

Package versions:

# packages in environment at C:\Users\user\python\envs\jl:
#
# Name                    Version                   Build  Channel
anyio                     4.3.0              pyhd8ed1ab_0    conda-forge
argon2-cffi               23.1.0             pyhd8ed1ab_0    conda-forge
argon2-cffi-bindings      21.2.0          py310h8d17308_4    conda-forge
arrow                     1.3.0              pyhd8ed1ab_0    conda-forge
asttokens                 2.4.1              pyhd8ed1ab_0    conda-forge
async-lru                 2.0.4              pyhd8ed1ab_0    conda-forge
attrs                     23.2.0             pyh71513ae_0    conda-forge
babel                     2.14.0             pyhd8ed1ab_0    conda-forge
beautifulsoup4            4.12.3             pyha770c72_0    conda-forge
bleach                    6.1.0              pyhd8ed1ab_0    conda-forge
brotli-python             1.1.0           py310h00ffb61_1    conda-forge
bzip2                     1.0.8                hcfcfb64_5    conda-forge
ca-certificates           2024.2.2             h56e8100_0    conda-forge
cached-property           1.5.2                hd8ed1ab_1    conda-forge
cached_property           1.5.2              pyha770c72_1    conda-forge
certifi                   2024.2.2           pyhd8ed1ab_0    conda-forge
cffi                      1.16.0          py310h8d17308_0    conda-forge
charset-normalizer        3.3.2              pyhd8ed1ab_0    conda-forge
colorama                  0.4.6              pyhd8ed1ab_0    conda-forge
comm                      0.2.2              pyhd8ed1ab_0    conda-forge
debugpy                   1.8.1           py310h00ffb61_0    conda-forge
decorator                 5.1.1              pyhd8ed1ab_0    conda-forge
defusedxml                0.7.1              pyhd8ed1ab_0    conda-forge
entrypoints               0.4                pyhd8ed1ab_0    conda-forge
exceptiongroup            1.2.0              pyhd8ed1ab_2    conda-forge
executing                 2.0.1              pyhd8ed1ab_0    conda-forge
fqdn                      1.5.1              pyhd8ed1ab_0    conda-forge
h11                       0.14.0             pyhd8ed1ab_0    conda-forge
h2                        4.1.0              pyhd8ed1ab_0    conda-forge
hpack                     4.0.0              pyh9f0ad1d_0    conda-forge
httpcore                  1.0.5              pyhd8ed1ab_0    conda-forge
httpx                     0.27.0             pyhd8ed1ab_0    conda-forge
hyperframe                6.0.1              pyhd8ed1ab_0    conda-forge
idna                      3.7                pyhd8ed1ab_0    conda-forge
importlib-metadata        7.1.0              pyha770c72_0    conda-forge
importlib_metadata        7.1.0                hd8ed1ab_0    conda-forge
importlib_resources       6.4.0              pyhd8ed1ab_0    conda-forge
ipykernel                 6.29.3             pyha63f2e9_0    conda-forge
ipython                   8.24.0             pyh7428d3b_0    conda-forge
ipywidgets                8.1.3              pyhd8ed1ab_0    conda-forge
isoduration               20.11.0            pyhd8ed1ab_0    conda-forge
jedi                      0.19.1             pyhd8ed1ab_0    conda-forge
jinja2                    3.1.4              pyhd8ed1ab_0    conda-forge
json5                     0.9.25             pyhd8ed1ab_0    conda-forge
jsonpointer               2.4             py310h5588dad_3    conda-forge
jsonschema                4.22.0             pyhd8ed1ab_0    conda-forge
jsonschema-specifications 2023.12.1          pyhd8ed1ab_0    conda-forge
jsonschema-with-format-nongpl 4.22.0             pyhd8ed1ab_0    conda-forge
jupyter                   1.0.0             pyhd8ed1ab_10    conda-forge
jupyter-lsp               2.2.5              pyhd8ed1ab_0    conda-forge
jupyter_client            8.6.2              pyhd8ed1ab_0    conda-forge
jupyter_console           6.6.3              pyhd8ed1ab_0    conda-forge
jupyter_core              5.7.2           py310h5588dad_0    conda-forge
jupyter_events            0.10.0             pyhd8ed1ab_0    conda-forge
jupyter_server            2.14.0             pyhd8ed1ab_0    conda-forge
jupyter_server_terminals  0.5.3              pyhd8ed1ab_0    conda-forge
jupyterlab                4.2.1              pyhd8ed1ab_0    conda-forge
jupyterlab_pygments       0.3.0              pyhd8ed1ab_1    conda-forge
jupyterlab_server         2.27.2             pyhd8ed1ab_0    conda-forge
jupyterlab_widgets        3.0.11             pyhd8ed1ab_0    conda-forge
krb5                      1.21.2               heb0366b_0    conda-forge
libffi                    3.4.2                h8ffe710_5    conda-forge
libsodium                 1.0.18               h8d14728_1    conda-forge
libsqlite                 3.45.3               hcfcfb64_0    conda-forge
libzlib                   1.3.1                h2466b09_1    conda-forge
markupsafe                2.1.5           py310h8d17308_0    conda-forge
matplotlib-inline         0.1.7              pyhd8ed1ab_0    conda-forge
mistune                   3.0.2              pyhd8ed1ab_0    conda-forge
nbclient                  0.10.0             pyhd8ed1ab_0    conda-forge
nbconvert                 7.16.4               hd8ed1ab_0    conda-forge
nbconvert-core            7.16.4             pyhd8ed1ab_0    conda-forge
nbconvert-pandoc          7.16.4               hd8ed1ab_0    conda-forge
nbformat                  5.10.4             pyhd8ed1ab_0    conda-forge
nest-asyncio              1.6.0              pyhd8ed1ab_0    conda-forge
notebook                  7.2.0              pyhd8ed1ab_0    conda-forge
notebook-shim             0.2.4              pyhd8ed1ab_0    conda-forge
openssl                   3.3.0                h2466b09_3    conda-forge
overrides                 7.7.0              pyhd8ed1ab_0    conda-forge
packaging                 24.0               pyhd8ed1ab_0    conda-forge
pandoc                    3.2                  h57928b3_0    conda-forge
pandocfilters             1.5.0              pyhd8ed1ab_0    conda-forge
parso                     0.8.4              pyhd8ed1ab_0    conda-forge
pickleshare               0.7.5                   py_1003    conda-forge
pip                       24.0               pyhd8ed1ab_0    conda-forge
pkgutil-resolve-name      1.3.10             pyhd8ed1ab_1    conda-forge
platformdirs              4.2.2              pyhd8ed1ab_0    conda-forge
prometheus_client         0.20.0             pyhd8ed1ab_0    conda-forge
prompt-toolkit            3.0.42             pyha770c72_0    conda-forge
prompt_toolkit            3.0.42               hd8ed1ab_0    conda-forge
psutil                    5.9.8           py310h8d17308_0    conda-forge
pure_eval                 0.2.2              pyhd8ed1ab_0    conda-forge
pycparser                 2.22               pyhd8ed1ab_0    conda-forge
pygments                  2.18.0             pyhd8ed1ab_0    conda-forge
pysocks                   1.7.1              pyh0701188_6    conda-forge
python                    3.10.14         h4de0772_0_cpython    conda-forge
python-dateutil           2.9.0              pyhd8ed1ab_0    conda-forge
python-fastjsonschema     2.19.1             pyhd8ed1ab_0    conda-forge
python-json-logger        2.0.7              pyhd8ed1ab_0    conda-forge
python_abi                3.10                    4_cp310    conda-forge
pytz                      2024.1             pyhd8ed1ab_0    conda-forge
pywin32                   306             py310h00ffb61_2    conda-forge
pywinpty                  2.0.13          py310h00ffb61_0    conda-forge
pyyaml                    6.0.1           py310h8d17308_1    conda-forge
pyzmq                     26.0.3          py310h656833d_0    conda-forge
qtconsole-base            5.5.2              pyha770c72_0    conda-forge
qtpy                      2.4.1              pyhd8ed1ab_0    conda-forge
referencing               0.35.1             pyhd8ed1ab_0    conda-forge
requests                  2.32.3             pyhd8ed1ab_0    conda-forge
rfc3339-validator         0.1.4              pyhd8ed1ab_0    conda-forge
rfc3986-validator         0.1.1              pyh9f0ad1d_0    conda-forge
rpds-py                   0.18.1          py310hc226416_0    conda-forge
send2trash                1.8.3              pyh5737063_0    conda-forge
setuptools                70.0.0             pyhd8ed1ab_0    conda-forge
six                       1.16.0             pyh6c4a22f_0    conda-forge
sniffio                   1.3.1              pyhd8ed1ab_0    conda-forge
soupsieve                 2.5                pyhd8ed1ab_1    conda-forge
stack_data                0.6.2              pyhd8ed1ab_0    conda-forge
terminado                 0.18.1             pyh5737063_0    conda-forge
tinycss2                  1.3.0              pyhd8ed1ab_0    conda-forge
tk                        8.6.13               h5226925_1    conda-forge
tomli                     2.0.1              pyhd8ed1ab_0    conda-forge
tornado                   6.4             py310h8d17308_0    conda-forge
traitlets                 5.14.3             pyhd8ed1ab_0    conda-forge
types-python-dateutil     2.9.0.20240316     pyhd8ed1ab_0    conda-forge
typing-extensions         4.11.0               hd8ed1ab_0    conda-forge
typing_extensions         4.11.0             pyha770c72_0    conda-forge
typing_utils              0.1.0              pyhd8ed1ab_0    conda-forge
tzdata                    2024a                h0c530f3_0    conda-forge
ucrt                      10.0.22621.0         h57928b3_0    conda-forge
uri-template              1.3.0              pyhd8ed1ab_0    conda-forge
urllib3                   2.2.1              pyhd8ed1ab_0    conda-forge
vc                        14.3                ha32ba9b_20    conda-forge
vc14_runtime              14.38.33135         h835141b_20    conda-forge
vs2015_runtime            14.38.33135         h22015db_20    conda-forge
wcwidth                   0.2.13             pyhd8ed1ab_0    conda-forge
webcolors                 1.13               pyhd8ed1ab_0    conda-forge
webencodings              0.5.1              pyhd8ed1ab_2    conda-forge
websocket-client          1.8.0              pyhd8ed1ab_0    conda-forge
wheel                     0.43.0             pyhd8ed1ab_1    conda-forge
widgetsnbextension        4.0.11             pyhd8ed1ab_0    conda-forge
win_inet_pton             1.1.0              pyhd8ed1ab_6    conda-forge
winpty                    0.4.3                         4    conda-forge
xz                        5.2.6                h8d14728_0    conda-forge
yaml                      0.2.5                h8ffe710_2    conda-forge
zeromq                    4.3.5                he1f189c_4    conda-forge
zipp                      3.17.0             pyhd8ed1ab_0    conda-forge