Kernel cannot be interrupted when using jupyter_client

[markolenik]

When sending code through the jupyter_client API to QtConsole, a process cannot be interrupted (e.g. using Ctrl-C). The only way to stop a running process is to restart the kernel (Ctrl-.).

Reproduce

To reproduce run the following code in QtConsole and try interrupting it with Ctrl-C (shouldn't work):

import jupyter_client as jc
import time

cfile = jc.find_connection_file()
km = jc.KernelManager(connection_file=cfile)
km.load_connection_file()
kc = km.client()
kc.start_channels()

msg = """
while True:
    print('hi again')
    time.sleep(0.5)
"""

kc.execute(msg)

System information

Ubuntu: 19.10
jupyter core : 4.6.3
jupyter-notebook : 6.0.2
qtconsole : 4.6.0
ipython : 7.12.0
ipykernel : 5.1.4
jupyter client : 5.3.4

[jacobm3]

Appears to still be an issue in Windows.

Jupyter QtConsole 4.7.3
Python 3.7.7 (default, May 6 2020, 11:45:54) [MSC v.1916 64 bit (AMD64)]
IPython 7.13.0

It prevents the Spyder debugger from stopping running Python apps. More detail here: spyder-ide/spyder#12640

[nmostert]

This is still causing issues for me.

Ubuntu 20.04
jupyter core : 4.7.1
jupyter-notebook : 6.4.0
qtconsole : 5.1.0
ipython : 7.24.0
ipykernel : 5.3.4
jupyter client : 6.1.12