Interrupt on swallowed `KeyboardInterrupt` exceptions (`SIGINT`) when pressing twice (within 5 seconds)

[krassowski]

Consider

import time
while True:
    try:
        time.sleep(1)
    except BaseException:
        pass

It is impossible to interrupt. But it does not have to be! With Python 3.12 we now have sys.monitoring and could instead show:

The running code caught the interrupt and kept going. Interrupt again within 5 seconds to force it to stop.

Current behaviour:

Screencast.From.2026-08-25.14-31-13.mp4

Proposed behaviour:

Screencast.From.2026-08-25.14-37-28.mp4

This would be similar to what jupyter-server does for interrupts with Ctrl + C (pressing it twice forces shutdown).

[jasongrout]

Thank you! +1 to making it possible for the user to escape the "sigint was caught" trap.