Spyder 5.3.1 hangs forever "connecting to kernel..." with jupyter_client 7.3.2 and 7.3.3

Issue Report Checklist

• [x ] Searched the issues page for similar reports
• [ x] Read the relevant sections of the Spyder Troubleshooting Guide and followed its advice
• [x ] Reproduced the issue after updating with conda update spyder (or pip, if not using Anaconda)
• Could not reproduce inside jupyter qtconsole (if console-related)
• [x ] Tried basic troubleshooting (if a bug/error)
  • [x ] Restarted Spyder
  • [x ] Reset preferences with spyder --reset
  • [ x] Reinstalled the latest version of Anaconda
  • [x ] Tried the other applicable steps from the Troubleshooting Guide
• [x ] Completed the Problem Description, Steps to Reproduce and Version sections below

Problem Description

I installed spyder in a fresh ubuntu mate 22.04 install and the following problem arrises: When invoking “spyder &” in the console the following errors are shown

mariano@dplab1:~$ spyder & [4] 26243 mariano@dplab1:~$ fromIccProfile: failed minimal tag size sanity /usr/lib/python3/dist-packages/pkg_resources/init.py:116: PkgResourcesDeprecationWarning: 1.16.0-unknown is an invalid version and will not be supported in a future release warnings.warn( /usr/lib/python3/dist-packages/pkg_resources/init.py:116: PkgResourcesDeprecationWarning: 1.1build1 is an invalid version and will not be supported in a future release warnings.warn( /usr/lib/python3/dist-packages/pkg_resources/init.py:116: PkgResourcesDeprecationWarning: 0.1.43ubuntu1 is an invalid version and will not be supported in a future release warnings.warn( ERROR:tornado.general:Uncaught exception in ZMQStream callback Traceback (most recent call last): File “/home/mariano/.local/lib/python3.10/site-packages/zmq/eventloop/zmqstream.py”, line 556, in _run_callback callback(*args, **kwargs) File “/home/mariano/.local/lib/python3.10/site-packages/jupyter_client/threaded.py”, line 117, in _handle_recv ident, smsg = self.session.feed_identities(msg_list) File “/home/mariano/.local/lib/python3.10/site-packages/jupyter_client/session.py”, line 968, in feed_identities idx = msg_list.index(DELIM) AttributeError: ‘_asyncio.Future’ object has no attribute ‘index’ ERROR:tornado.general:Uncaught exception in zmqstream callback Traceback (most recent call last): File “/home/mariano/.local/lib/python3.10/site-packages/zmq/eventloop/zmqstream.py”, line 577, in _handle_events self._handle_recv() File “/home/mariano/.local/lib/python3.10/site-packages/zmq/eventloop/zmqstream.py”, line 606, in _handle_recv self._run_callback(callback, msg) File “/home/mariano/.local/lib/python3.10/site-packages/zmq/eventloop/zmqstream.py”, line 556, in _run_callback callback(*args, **kwargs) File “/home/mariano/.local/lib/python3.10/site-packages/jupyter_client/threaded.py”, line 117, in _handle_recv ident, smsg = self.session.feed_identities(msg_list) File “/home/mariano/.local/lib/python3.10/site-packages/jupyter_client/session.py”, line 968, in feed_identities idx = msg_list.index(DELIM) AttributeError: ‘_asyncio.Future’ object has no attribute ‘index’ ERROR:asyncio:Exception in callback BaseAsyncIOLoop._handle_events(115, 1) handle: <Handle BaseAsyncIOLoop._handle_events(115, 1)>

[… lot more errrors …]

, but spyder starts (almost) correctly. The problem is that the ipython console hangs forever with the message “connecting to kernel…”. I can restart the kernel and the following appear:

Python 3.10.4 (main, Apr 2 2022, 09:04:19) [GCC 11.2.0] Type “copyright”, “credits” or “license” for more information.

IPython 7.34.0 – An enhanced Interactive Python.

Restarting kernel…

but nothing else happen. Still hang there.

What steps reproduce the problem?

1. start spyder from console
2. thats all

What is the expected output? What do you see instead?

Start spyder normally and prompt in the console.

Paste Traceback/Error Below (if applicable)

Spyder Internal Console

This console is used to report application
internal errors and to inspect Spyder
internals with the following commands:
  spy.app, spy.window, dir(spy)

Please do not use it to run your code

>>> /usr/lib/python3/dist-packages/pkg_resources/__init__.py:116: PkgResourcesDeprecationWarning: 1.16.0-unknown is an invalid version and will not be supported in a future release
  warnings.warn(
/usr/lib/python3/dist-packages/pkg_resources/__init__.py:116: PkgResourcesDeprecationWarning: 1.1build1 is an invalid version and will not be supported in a future release
  warnings.warn(
/usr/lib/python3/dist-packages/pkg_resources/__init__.py:116: PkgResourcesDeprecationWarning: 0.1.43ubuntu1 is an invalid version and will not be supported in a future release
  warnings.warn(
/usr/lib/python3/dist-packages/pkg_resources/__init__.py:116: PkgResourcesDeprecationWarning: 1.16.0-unknown is an invalid version and will not be supported in a future release
  warnings.warn(
/usr/lib/python3/dist-packages/pkg_resources/__init__.py:116: PkgResourcesDeprecationWarning: 1.1build1 is an invalid version and will not be supported in a future release
  warnings.warn(
/usr/lib/python3/dist-packages/pkg_resources/__init__.py:116: PkgResourcesDeprecationWarning: 0.1.43ubuntu1 is an invalid version and will not be supported in a future release
  warnings.warn(

Versions

• Spyder version: 5.3.1 None
• Python version: 3.10.4 64-bit
• Qt version: 5.15.3
• PyQt5 version: 5.15.6
• Operating System: Linux 5.15.0-35-generic

Dependencies

# Mandatory:
atomicwrites >=1.2.0          :  1.4.0 (OK)
chardet >=2.0.0               :  4.0.0 (OK)
cloudpickle >=0.5.0           :  2.1.0 (OK)
cookiecutter >=1.6.0          :  2.1.1 (OK)
diff_match_patch >=20181111   :  20200713 (OK)
intervaltree >=3.0.2          :  3.1.0 (OK)
IPython >=7.31.1;<8.0.0       :  7.34.0 (OK)
jedi >=0.17.2;<0.19.0         :  0.18.1 (OK)
jellyfish >=0.7               :  0.9.0 (OK)
jsonschema >=3.2.0            :  4.6.0 (OK)
keyring >=17.0.0              :  23.5.0 (OK)
nbconvert >=4.0               :  6.5.0 (OK)
numpydoc >=0.6.0              :  1.3.1 (OK)
parso >=0.7.0;<0.9.0          :  0.8.3 (OK)
pexpect >=4.4.0               :  4.8.0 (OK)
pickleshare >=0.4             :  0.7.5 (OK)
psutil >=5.3                  :  5.9.0 (OK)
pygments >=2.0                :  2.12.0 (OK)
pylint >=2.5.0                :  2.14.0 (OK)
pyls_spyder >=0.4.0           :  0.4.0 (OK)
pylsp >=1.4.1;<1.5.0          :  1.4.1 (OK)
pylsp_black >=1.2.0           :  1.2.1 (OK)
qdarkstyle >=3.0.2;<3.1.0     :  3.0.3 (OK)
qstylizer >=0.1.10            :  0.2.1 (OK)
qtawesome >=1.0.2             :  1.1.1 (OK)
qtconsole >=5.3.0;<5.4.0      :  5.3.1 (OK)
qtpy >=2.1.0                  :  2.1.0 (OK)
rtree >=0.9.7                 :  1.0.0 (OK)
setuptools >=49.6.0           :  59.6.0 (OK)
sphinx >=0.6.6                :  5.0.1 (OK)
spyder_kernels >=2.3.1;<2.4.0 :  2.3.1 (OK)
textdistance >=4.2.0          :  4.2.2 (OK)
three_merge >=0.1.1           :  0.1.1 (OK)
watchdog >=0.10.3             :  2.1.8 (OK)
xdg >=0.26                    :  0.27 (OK)
zmq >=22.1.0                  :  23.1.0 (OK)

# Optional:
cython >=0.21                 :  None (NOK)
matplotlib >=3.0.0            :  None (NOK)
numpy >=1.7                   :  1.22.4 (OK)
pandas >=1.1.1                :  None (NOK)
scipy >=0.17.0                :  1.8.1 (OK)
sympy >=0.7.3                 :  1.10.1 (OK)

[jfprieur]

Hi @marianux and @jfprieur thank you for the feedback! Could you try to downgrade jupyter_client to 7.3.1 ? Seems like 7.3.2 was released a couple of hours ago and is causing this traceback. Let us know!

Thank you for the quick reply, downgrading to jupyter_client==7.3.1 did the trick!

[ccordoba12]

This error is fixed now in jupyter_client 7.3.4. It’s already available on PyPI and it will be on Conda-forge in three or four hours.