Reset ipython kernel

Question

I was wondering if there is a way to restart the ipython kernel without closing it, like the kernel restart function that exists in the notebook. I tried %reset but that doesn't seem to clear the imports.

For me it seems to clear also imports (ipython 2.2, macosx): In [1]: %whos Interactive namespace is empty. In [2]: import os In [3]: %whos Variable Type Data/Info ------------------------------ os module .7/lib/python2.7/os.pyc'> In [4]: %reset Once deleted, variables cannot be recovered. Proceed (y/[n])? y In [5]: %whos Interactive namespace is empty. — bjonen, Oct 28 '14 at 10:52
Yes the namespace is cleared, but when re-importing it seems to read a cached version of the module, so I have to use something like http://stackoverflow.com/questions/437589/how-do-i-unload-reload-a-python-module. — greole, Oct 28 '14 at 12:35
Ah ok I see. You could also use http://ipython.org/ipython-doc/dev/config/extensions/autoreload.html. But I understand this is not exactly what you are looking for. — bjonen, Oct 29 '14 at 08:02
Call/duplicate the "kernel restart function that exists in the notebook"? — ivan_pozdeev, Feb 18 '16 at 10:15
I do it all the time. The shortcut is Ctrl-'.' [ctrl-period]. Just tested on Linux and it only works in qtconsole. — Muposat, Feb 21 '16 at 03:53

score 15 · Answer 1 · answered Feb 22 '16 at 13:05

Even though it would be handy if %reset would clear the namespace and the cache for the imports (as in the notebook) one can explicitly reload a previously imported module using importlib.reload in python3.4 or imp.reload in python3.0-3.3 (and if needed reset the kernel in a second step).

score 6 · Answer 2 · answered Feb 23 '16 at 05:39

I could restart the kernel, but some console sessions take longer to reconnect. Notebook detects kernel restart instantly.

ipykernel.ipkernel.IPythonKernel class has a do_shutdown method with restart parameter which defaults to False.

Get a reference to ipykernel.kernelapp.IPKernelApp which has a reference to the kernel and call do_shutdown of the kernel by passing True.

import IPython
app = IPython.Application.instance()
app.kernel.do_shutdown(True)

How did I test?

$ #start notebook
$ jupyter notebook

$ #connect to existing kernel
$ jupyter console --existing

score 5 · Answer 3 · answered Aug 02 '18 at 03:37

5

If you have installed Spyder with anaconda, then open Spyder window.

Then Consoles (menu bar) -> Restart Consoles.

or you can use CTRL+. which is a shortcut key to restart the console.

answered Aug 02 '18 at 03:37

Jayesh Baviskar

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score 3 · Answer 4 · answered Apr 27 '20 at 11:11

3

I personaly use add these two lines at the top of each ipynb file in JupyterLab:

load_ext autoreload
%autoreload 2

It allows you to update the code in an adjacent xxx.py file, without having to restart the Kernel, which was a huge painpoint for me.

answered Apr 27 '20 at 11:11

Nielsou Akbrg

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score 1 · Answer 5 · edited Feb 23 '16 at 00:19

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In the qt console you could hit ctrl-

edited Feb 23 '16 at 00:19

tumultous_rooster

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answered Feb 22 '16 at 15:29

Seekheart

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score 0 · Answer 6 · answered Feb 25 '16 at 07:29

0

IPython Qt-console has a reset kernel feature. You could use that if you are using IPython Qt. IMO it is better than using from the shell.

answered Feb 25 '16 at 07:29

gokul_uf

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score -5 · Answer 7 · answered Oct 21 '19 at 23:03

-5

In 3.7 Anaconda, just go to Kernel, select Restart

answered Oct 21 '19 at 23:03

MSIS

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nice camera shots 镜头 ~ – CS QGB Dec 16 '19 at 11:44

Reset ipython kernel

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