无法在某些 Jupyiter ipython 笔记本单元格中执行代码

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.

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.

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.

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

Answer 4

This happened to me just a few days ago. If you look closely, you can see the in[*] before the code cell. This means that it's busy. Try restarting the kernel again, or close and reopen jupyter notebook. If the issue still persists, it has something to do with the previous cells (the code in previous cells might take too long to run causing those cells to be busy).

Answer 5

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.