[Python-Dev] Default SIGINT handling dangerous?

Guido van Rossum guido at python.org
Sat Dec 14 17:31:26 CET 2013

Your subject should probably have mentioned Windows. SIGINT handling
on UNIX is well-behaved. Yes, you can interrupt a finally clause, but
this by itself doesn't threaten the integrity of the interpreter and
the standard data types.

On Windows, "signal" handling is some feeble emulation done by the C
library wrappers and all bets are, as you've discovered, off. My own
experience is the opposite of yours -- I often end up with
uninterruptable runaway code that can only be stopped by ctrl-BRK,
which takes e.g. Powershell with it. :-(

That said, I'd be fine with a command-line flag to skip the default
SIGINT handler setup.

--Guido van Rossum (python.org/~guido)

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