Interrupting kernel can only be used once

[CYHSM]

Bug: Notebook Editor, Interactive Window, Editor cells

Steps to cause the bug to occur

1. Open a jupyter notebook
2. Run following example code in a cell:

import time
for i in range(0, 100):
    try:
        print(i)
        time.sleep(0.5)
    except KeyboardInterrupt:
        print('You stopped run i={} early'.format(i))
        print('Hit interrupt button again if you want to exit')
        time.sleep(0.5)

3. Try to interrupt kernel (before loop is finished)

Actual behavior

The above loop finishes although kernel was interrupted. This is a special case which I use for interrupting some loops while not interrupting the full process (therefore the KeyboardInterrupt). However, when I use jupyter notebook I can just call interrupt twice when I want to leave the loop. After calling it once in vscode the button for interruption is greyed out and I see a loading bar on top, can't restart kernel in this case and have to close the notebook and reopen it to restart the kernel.

Expected behavior

It would be nice to have the ability to interrupt the kernel until the kernel is actually interrupted. This is probably only an issue if somebody uses "except KeyboardInterrupt" but if it is possible to fix would be nice. Thanks.

Your Jupyter and/or Python environment

Please provide as much info as you readily know

• Jupyter server running: happens Local & Remote
• Extension version: 2020.2.64397
• VS Code version: 1.43
• Setting python.jediEnabled: false
• Python and/or Anaconda version: Python 3.7.6
• OS: Linux (ubuntu):
• Virtual environment: conda

[y-x-c]

I encountered the same problem as well. To reproduce the problem: run a cell (which takes for a while) and run this cell again before previous call ends. Now if we click the interrupt kernel, the first call will be interrupted, but the second call starts. At the mean while, the interrupt button greyed out and can not be clicked until I reopen the notebook.

[DavidKutu]

Thanks for the issue @CYHSM, we'll look into it.

I can also reproduce it on Windows.

[greazer]

To fix, let's not disable the interrupt button if it's clicked before the interrupt actually occurs.

[rchiodo]

This is not fixed. The code in the issue still doesn't work.

[rchiodo]

For me the interrupt button works, but then two things happen:

1. Interrupt button is disabled so I can't hit again
2. A message shows up asking if I'd like to restart after 60 seconds.

[IanMatthewHuff]

Doesn't look validated to me. I see the same thing that Rich was seeing where the button is enabled, but the second interrupt never happens and eventually I get a message saying that the interrupt failed and I can restart instead. Tested in raw and jupyter.

[IanMatthewHuff]

Was previously in may nice to have, so moving to june nice to have.