Cannot execute code in some of Jupyiter ipython notebook cells

Question

Any cells in Jupyter which have In [*] in front of them are not executing in Jupyter notebook. See image below:

I even restarted the kernel, without any improvement of the situation. Previous cells run without trouble. Every cell I added recently has the problem.

Doorsill

Why do you have lines that start that way? – Morgan

@zondo, please see the added image. I didn't add those. Those were in front of each cell. I guess ln indicates line number – Doorsill

What is the console output of the Jupyter kernel? Can you run normal ipython? – Sum

there is no such notable output in the console. – Doorsill

Can you run ipython in a terminal? What about jupyter console? Is there anything the cells that have problems have in common - e.g. do they all start with a blank line like the picture in the question? Does the browser's JS console show any errors when this happens? – Eggleston

Thanks guys.. I did remove a top blank line from one of the cells. It runs after many restarts of the kernel. Oh God :) – Doorsill

@Doorsill Did you resolve this problem? I'm facing it right now... – Feminize

Answer 1

I recommend you the following steps:

1. Close ipython notebook, and then reopen the file.
2. If 1 does not work, then restart the kernel and reopen the file.
3. If 2 does not work, then try whether things work fine on console. Type ipython and check whether your code statements work.
4. If 3 does not work, try reinstalling the scientific python distribution if you are using Anaconda or Enthought.

Encaenia

Answer 2

I have encountered same problem on my windows machine.Try Jupyter with Anaconda on Windows will not run cells. Probably your antivirus program or your iis is blocking default 8888 port.

Handicraftsman

Answer 3

Downgrading tornado to 4.5.3 fixed my problem. with

pip - sudo python3.6 -m pip install tornado==4.5.3
conda - conda install tornado==4.5.3

use this for this bugs

Monumental

Answer 4

You probably have a lot of notebooks(tabs) open with running kernels in them. You can check this by clicking on this icon 1 on the left. There you see all the running kernels in all your open notebooks and shut them down.2 This should solve your problem.

Feebleminded

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