'Kernel Restart (Ctrl+.) in spyder not working

I have recently updated my Anaconda and Spyder app! But in this new version of Spyder (version 4), when I restart the kernel (with short key and from console in above ribbon), the Restart kernel confirmation window shows up, Then I press the "yes" button but nothing happens. Can anyone help me with this?
Solution 1:^[1]

I have the same problem with Spyder 5.2.2 :
Spyder version: 5.2.2 None
Python version: 3.7.9 64-bit
Qt version: 5.12.10
PyQt5 version: 5.12.3
Operating System: Windows 10
When restarting the kernel, I get this:
Python 3.7.9 (tags/v3.7.9:13c94747c7, Aug 17 2020, 18:58:18) [MSC v.1900 64 bit (AMD64)]
Type "copyright", "credits" or "license" for more information.

IPython 7.31.1 -- An enhanced Interactive Python.

Restarting kernel...
 

Traceback (most recent call last):
  File "C:\Users\fa125436\Miniconda3\lib\runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "C:\Users\fa125436\Miniconda3\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\spyder_kernels\console\__main__.py", line 22, in <module>
    from spyder_kernels.console import start
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\spyder_kernels\console\start.py", line 21, in <module>
    import ipykernel
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\ipykernel\__init__.py", line 2, in <module>
    from .connect import *
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\ipykernel\connect.py", line 10, in <module>
    import jupyter_client
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\__init__.py", line 6, in <module>
    from .asynchronous import AsyncKernelClient  # noqa
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\asynchronous\__init__.py", line 1, in <module>
    from .client import AsyncKernelClient  # noqa
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\asynchronous\client.py", line 6, in <module>
    from jupyter_client.channels import HBChannel
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\channels.py", line 12, in <module>
    import zmq.asyncio
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\__init__.py", line 125, in <module>
    from zmq import backend
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\__init__.py", line 32, in <module>
    raise original_error from None
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\__init__.py", line 27, in <module>
    _ns = select_backend(first)
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\select.py", line 32, in select_backend
    mod = import_module(name)
  File "C:\Users\fa125436\Miniconda3\lib\importlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\cython\__init__.py", line 6, in <module>
    from . import (
ImportError: cannot import name 'constants' from partially initialized module 'zmq.backend.cython' (most likely due to a circular import) (C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\cython\__init__.py)

Traceback (most recent call last):
  File "C:\Users\fa125436\Miniconda3\lib\runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "C:\Users\fa125436\Miniconda3\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\spyder_kernels\console\__main__.py", line 22, in <module>
    from spyder_kernels.console import start
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\spyder_kernels\console\start.py", line 21, in <module>
    import ipykernel
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\ipykernel\__init__.py", line 2, in <module>
    from .connect import *
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\ipykernel\connect.py", line 10, in <module>
    import jupyter_client
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\__init__.py", line 6, in <module>
    from .asynchronous import AsyncKernelClient  # noqa
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\asynchronous\__init__.py", line 1, in <module>
    from .client import AsyncKernelClient  # noqa
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\asynchronous\client.py", line 6, in <module>
    from jupyter_client.channels import HBChannel
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\channels.py", line 12, in <module>
    import zmq.asyncio
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\__init__.py", line 125, in <module>
    from zmq import backend
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\__init__.py", line 32, in <module>
    raise original_error from None
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\__init__.py", line 27, in <module>
    _ns = select_backend(first)
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\select.py", line 32, in select_backend
    mod = import_module(name)
  File "C:\Users\fa125436\Miniconda3\lib\importlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\cython\__init__.py", line 6, in <module>
    from . import (
ImportError: cannot import name 'constants' from partially initialized module 'zmq.backend.cython' (most likely due to a circular import) (C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\cython\__init__.py)

Traceback (most recent call last):
  File "C:\Users\fa125436\Miniconda3\lib\runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "C:\Users\fa125436\Miniconda3\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\spyder_kernels\console\__main__.py", line 22, in <module>
    from spyder_kernels.console import start
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\spyder_kernels\console\start.py", line 21, in <module>
    import ipykernel
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\ipykernel\__init__.py", line 2, in <module>
    from .connect import *
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\ipykernel\connect.py", line 10, in <module>
    import jupyter_client
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\__init__.py", line 6, in <module>
    from .asynchronous import AsyncKernelClient  # noqa
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\asynchronous\__init__.py", line 1, in <module>
    from .client import AsyncKernelClient  # noqa
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\asynchronous\client.py", line 6, in <module>
    from jupyter_client.channels import HBChannel
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\channels.py", line 12, in <module>
    import zmq.asyncio
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\__init__.py", line 125, in <module>
    from zmq import backend
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\__init__.py", line 32, in <module>
    raise original_error from None
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\__init__.py", line 27, in <module>
    _ns = select_backend(first)
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\select.py", line 32, in select_backend
    mod = import_module(name)
  File "C:\Users\fa125436\Miniconda3\lib\importlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\cython\__init__.py", line 6, in <module>
    from . import (
ImportError: cannot import name 'constants' from partially initialized module 'zmq.backend.cython' (most likely due to a circular import) (C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\cython\__init__.py)

Traceback (most recent call last):
  File "C:\Users\fa125436\Miniconda3\lib\runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "C:\Users\fa125436\Miniconda3\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\spyder_kernels\console\__main__.py", line 22, in <module>
    from spyder_kernels.console import start
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\spyder_kernels\console\start.py", line 21, in <module>
    import ipykernel
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\ipykernel\__init__.py", line 2, in <module>
    from .connect import *
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\ipykernel\connect.py", line 10, in <module>
    import jupyter_client
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\__init__.py", line 6, in <module>
    from .asynchronous import AsyncKernelClient  # noqa
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\asynchronous\__init__.py", line 1, in <module>
    from .client import AsyncKernelClient  # noqa
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\asynchronous\client.py", line 6, in <module>
    from jupyter_client.channels import HBChannel
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\channels.py", line 12, in <module>
    import zmq.asyncio
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\__init__.py", line 125, in <module>
    from zmq import backend
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\__init__.py", line 32, in <module>
    raise original_error from None
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\__init__.py", line 27, in <module>
    _ns = select_backend(first)
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\select.py", line 32, in select_backend
    mod = import_module(name)
  File "C:\Users\fa125436\Miniconda3\lib\importlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\cython\__init__.py", line 6, in <module>
    from . import (
ImportError: cannot import name 'constants' from partially initialized module 'zmq.backend.cython' (most likely due to a circular import) (C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\cython\__init__.py)

Traceback (most recent call last):
  File "C:\Users\fa125436\Miniconda3\lib\runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "C:\Users\fa125436\Miniconda3\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\spyder_kernels\console\__main__.py", line 22, in <module>
    from spyder_kernels.console import start
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\spyder_kernels\console\start.py", line 21, in <module>
    import ipykernel
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\ipykernel\__init__.py", line 2, in <module>
    from .connect import *
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\ipykernel\connect.py", line 10, in <module>
    import jupyter_client
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\__init__.py", line 6, in <module>
    from .asynchronous import AsyncKernelClient  # noqa
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\asynchronous\__init__.py", line 1, in <module>
    from .client import AsyncKernelClient  # noqa
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\asynchronous\client.py", line 6, in <module>
    from jupyter_client.channels import HBChannel
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\channels.py", line 12, in <module>
    import zmq.asyncio
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\__init__.py", line 125, in <module>
    from zmq import backend
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\__init__.py", line 32, in <module>
    raise original_error from None
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\__init__.py", line 27, in <module>
    _ns = select_backend(first)
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\select.py", line 32, in select_backend
    mod = import_module(name)
  File "C:\Users\fa125436\Miniconda3\lib\importlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\cython\__init__.py", line 6, in <module>
    from . import (
ImportError: cannot import name 'constants' from partially initialized module 'zmq.backend.cython' (most likely due to a circular import) (C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\cython\__init__.py)

Traceback (most recent call last):
  File "C:\Users\fa125436\Miniconda3\lib\runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "C:\Users\fa125436\Miniconda3\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\spyder_kernels\console\__main__.py", line 22, in <module>
    from spyder_kernels.console import start
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\spyder_kernels\console\start.py", line 21, in <module>
    import ipykernel
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\ipykernel\__init__.py", line 2, in <module>
    from .connect import *
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\ipykernel\connect.py", line 10, in <module>
    import jupyter_client
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\__init__.py", line 6, in <module>
    from .asynchronous import AsyncKernelClient  # noqa
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\asynchronous\__init__.py", line 1, in <module>
    from .client import AsyncKernelClient  # noqa
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\asynchronous\client.py", line 6, in <module>
    from jupyter_client.channels import HBChannel
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\jupyter_client\channels.py", line 12, in <module>
    import zmq.asyncio
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\__init__.py", line 125, in <module>
    from zmq import backend
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\__init__.py", line 32, in <module>
    raise original_error from None
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\__init__.py", line 27, in <module>
    _ns = select_backend(first)
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\select.py", line 32, in select_backend
    mod = import_module(name)
  File "C:\Users\fa125436\Miniconda3\lib\importlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\cython\__init__.py", line 6, in <module>
    from . import (
ImportError: cannot import name 'constants' from partially initialized module 'zmq.backend.cython' (most likely due to a circular import) (C:\Users\fa125436\AppData\Local\Programs\Spyder\pkgs\zmq\backend\cython\__init__.py)
Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.
Source: Stack Overflow
Solution	Source
Solution 1	Fabrice Auzanneau
'Kernel Restart (Ctrl+.) in spyder not working

Solution 1:[1]

Sources

Related Questions

Solution 1:^[1]
