Can't Interrupt Kernel

[Dave Hirschfeld]

In the IPython console in spyder the Kernel interrupt doesn't seem to be working. The following code will put you in an infinite, unbreakable loop:

In [1]: from time import sleep

In [2]: while True:

   ...: sleep(2)

   ...:

Clicking Ctrl-C has no effect, nor does using the "Interrupt Kernel" button on the top -right of the IPython console pane.

By contrast in the QtConsole itself I observe the expected behaviour when pressing Ctrl-C:

In [1]: from time import sleep

In [2]: while True:

   ...: sleep(2)

   ...:

---------------------------------------------------------------------------

KeyboardInterrupt Traceback (most recent call last)

<ipython-input-2-4fdabcf7d3fc> in <module>()

1 while True:

----> 2 sleep(2)

3

KeyboardInterrupt:

In [3]: from IPython import sys_info; print(sys_info())

{'commit_hash': '681fd77',

'commit_source': 'installation',

'default_encoding': 'cp1252',

'ipython_path': 'C:\\dev\\bin\\Anaconda\\lib\\site-packages\\IPython',

'ipython_version': '2.1.0',

'os_name': 'nt',

'platform': 'Windows-7-6.1.7601-SP1',

'sys_executable': 'C:\\dev\\bin\\Anaconda\\python.exe',

'sys_platform': 'win32',

'sys_version': '2.7.5 |Anaconda 1.9.2 (64-bit)| (default, Jul 1 2013, 12:37:52) [MSC v.1500 64 bit (AMD64)]'}

Suspiciously, when I start an IPython console in the Kernel tab in the Console pane I see the following message:

NOTE: When using the `ipython kernel` entry point, Ctrl-C will not work.

To exit, you will have to explicitly quit this process, by either sending

"quit" from a client, or using Ctrl-\ in UNIX-like environments.

To read more about this, see https://github.com/ipython/ipython/issues/2049

To connect another client to this kernel, use:

    --existing kernel-11532.json

Since this works in the IPython QtConsole would it be possible to get it working in Spyder as well?

As it is currently I'm doing a lot of IPython.parallel work where I need to be able to interrupt a parallel calculation (a loop, waiting on asynchronous results) and it's very annoying to lose my session if I want to do so.

Thanks,

Dave

[Carlos Córdoba]

Hi Dave,

This is working for me with IPython 2.1.0. Are you using IPython master?


Cheers,
Carlos

El 06/06/14 06:38, Dave Hirschfeld escribió:

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[Dave Hirschfeld]

On Thursday, 12 June 2014 03:51:23 UTC+1, Carlos Córdoba wrote:

Hi Dave,

This is working for me with IPython 2.1.0. Are you using IPython master?


Cheers,
Carlos

I'm running 2.1 also. I've since upgraded spyder to the latest master and rebooted my PC and can't seem to reproduce the issue either. Sorry for the noise...

-Dave 

[Dave Hirschfeld]

On Thursday, 12 June 2014 03:51:23 UTC+1, Carlos Córdoba wrote:

Hi Dave,

This is working for me with IPython 2.1.0. Are you using IPython master?


Cheers,
Carlos

I've managed to reproduce it!

The trick is that it always works in a newly opened IPython console. It's only after you Restart the console that you lose the ability to break out of any loops with Ctrl-C.

I hit this problem because I'm always hitting Ctrl-. to restart my console as it's quicker and more convenient than opening a new console.

Note that this doesn't occur in the qtconsole for me.

Let me know if you can repro the problem!

Thanks,

Dave

In [1]: from time import sleep

   ...: while True:

   ...: sleep(2)

   ...:

---------------------------------------------------------------------------

KeyboardInterrupt Traceback (most recent call last)

<ipython-input-1-0b0776baa1cf> in <module>()

1 from time import sleep

2 while True:

----> 3 sleep(2)

4

KeyboardInterrupt:

Restarting kernel...

---

In [1]: from time import sleep

   ...: while True:

   ...: sleep(2)

---------------------------------------------------------------------------

KeyboardInterrupt Traceback (most recent call last)

<ipython-input-1-96b4b67498f8> in <module>()

1 from time import sleep

2 while True:

----> 3 sleep(2)

KeyboardInterrupt:

In [1]:

[Carlos Córdoba]

Hi,

Very good catch! Please open an issue so we don't forget to address it. I'll try to fix for 2.3.1.


Cheers,
Carlos

El 17/06/14 07:18, Dave Hirschfeld escribió:

[Dave Hirschfeld]

On Thursday, 19 June 2014 23:00:13 UTC+1, Carlos Córdoba wrote:

Hi,

Very good catch! Please open an issue so we don't forget to address it. I'll try to fix for 2.3.1.


Cheers,
Carlos

El 17/06/14 07:18, Dave Hirschfeld escribió:

On Thursday, 12 June 2014 03:51:23 UTC+1, Carlos Córdoba wrote:

Hi Dave,

This is working for me with IPython 2.1.0. Are you using IPython master?


Cheers,
Carlos

I've managed to reproduce it!

The trick is that it always works in a newly opened IPython console. It's only after you Restart the console that you lose the ability to break out of any loops with Ctrl-C.

I hit this problem because I'm always hitting Ctrl-. to restart my console as it's quicker and more convenient than opening a new console.

Note that this doesn't occur in the qtconsole for me.

Let me know if you can repro the problem!

Thanks,

Dave

Done!

https://code.google.com/p/spyderlib/issues/detail?id=1863

-Dave