Error thrown when re-starting kernel

Description

What steps will reproduce the problem?

1. In the hamburg menu of the interpreter press “Restart kernel”

Traceback

  File "/Applications/Spyder.app/Contents/Resources/lib/python3.9/spyder/plugins/ipythonconsole/widgets/client.py", line 642, in _restart_thread_main
    self.shellwidget.kernel_manager.restart_kernel(
  File "jupyter_client/manager.pyc", line 454, in restart_kernel
  File "jupyter_client/manager.pyc", line 314, in start_kernel
  File "qtconsole/manager.pyc", line 57, in post_start_kernel
  File "jupyter_client/manager.pyc", line 295, in post_start_kernel
  File "jupyter_client/manager.pyc", line 228, in _connect_control_socket
  File "jupyter_client/connect.pyc", line 545, in _create_connected_socket
  File "/Applications/Spyder.app/Contents/Resources/lib/python3.9/zmq/sugar/context.py", line 234, in socket
    raise ZMQError(ENOTSUP)
zmq.error.ZMQError: Operation not supported
Traceback (most recent call last):
  File "/Applications/Spyder.app/Contents/Resources/lib/python3.9/spyder/plugins/ipythonconsole/widgets/client.py", line 629, in <lambda>
    lambda: self._finalise_restart(True))
  File "/Applications/Spyder.app/Contents/Resources/lib/python3.9/spyder/plugins/ipythonconsole/widgets/client.py", line 664, in _finalise_restart
    sw.spyder_kernel_comm.open_comm(sw.kernel_client)
  File "/Applications/Spyder.app/Contents/Resources/lib/python3.9/spyder/plugins/ipythonconsole/comms/kernelcomm.py", line 135, in open_comm
    kernel_client.comm_manager.new_comm(self._comm_name, data={
AttributeError: 'NoneType' object has no attribute 'new_comm'

Versions

• Spyder version: 4.2.2
• Python version: 3.9.1
• Qt version: 5.12.10
• PyQt5 version: 5.12.3
• Operating System: Darwin 20.3.0

Dependencies

# Mandatory:
applaunchservices >=0.1.7       :  0.2.1 (OK)
atomicwrites >=1.2.0            :  1.4.0 (OK)
chardet >=2.0.0                 :  4.0.0 (OK)
cloudpickle >=0.5.0             :  1.6.0 (OK)
diff_match_patch >=20181111     :  20200713 (OK)
intervaltree >=3.0.2            :  3.1.0 (OK)
IPython >=7.6.0                 :  7.20.0 (OK)
jedi =0.17.2                    :  0.17.2 (OK)
jsonschema >=3.2.0              :  3.2.0 (OK)
keyring >=17.0.0                :  22.0.1 (OK)
nbconvert >=4.0                 :  6.0.7 (OK)
numpydoc >=0.6.0                :  1.1.0 (OK)
parso =0.7.0                    :  0.7.0 (OK)
pexpect >=4.4.0                 :  4.8.0 (OK)
pickleshare >=0.4               :  0.7.5 (OK)
psutil >=5.3                    :  5.8.0 (OK)
pygments >=2.0                  :  2.8.0 (OK)
pylint >=1.0                    :  2.7.0 (OK)
pyls >=0.36.2;<1.0.0            :  0.36.2 (OK)
pyls_black >=0.4.6              :  0.4.6 (OK)
pyls_spyder >=0.3.2             :  0.3.2 (OK)
qdarkstyle >=2.8                :  2.8.1 (OK)
qtawesome >=0.5.7               :  1.0.2 (OK)
qtconsole >=5.0.1               :  5.0.2 (OK)
qtpy >=1.5.0                    :  1.9.0 (OK)
setuptools >=39.0.0             :  52.0.0 (OK)
sphinx >=0.6.6                  :  3.5.1 (OK)
spyder_kernels >=1.10.2;<1.11.0 :  1.10.2 (OK)
textdistance >=4.2.0            :  4.2.1 (OK)
three_merge >=0.1.1             :  0.1.1 (OK)
watchdog >=0.10.3;<2.0.0        :  1.0.2 (OK)
zmq >=17                        :  22.0.3 (OK)

# Optional:
cython >=0.21                   :  0.29.22 (OK)
matplotlib >=2.0.0              :  3.3.4 (OK)
numpy >=1.7                     :  1.20.1 (OK)
pandas >=1.1.1                  :  1.2.2 (OK)
scipy >=0.17.0                  :  1.6.1 (OK)
sympy >=0.7.3                   :  1.7.1 (OK)

[b-a0]

Thanks for looking into this.

Yes, I’m on Big Sur (11.2.1 at the time of this issue, now on 11.2.2).

I’ve tried out the different options from this comment, restarting Spyder in between my tries, but can no longer reproduce this issue. Hence I’m closing it.

[mrclary]

@b-a0 I’m glad it’s working for you now. If the issue resurfaces, please reopen the issue with any new information.