On Wed, Feb 6, 2019 at 10:29 AM jonathan.kliem via sage-devel
<sage-devel@googlegroups.com> wrote:
>
> sage: alarm(1)
> sage:
>
> AlarmInterrupt escaped interact()
>
> sage:
> sage:
> ^[[50;1R
> **********************************************************************
>
> Oops, Sage crashed. We do our best to make it stable, but...
>
> ...
>
> Is this supposed to happen?
I think obviously not :)
I can confirm the same. It's not clear how long this has been the
case--it looks to me like a bug/oddity in IPython?
The exception is originating from IPython.terminal.interactiveshell
which contains the following:
def mainloop(self, display_banner=DISPLAY_BANNER_DEPRECATED):
# An extra layer of protection in case someone mashing Ctrl-C breaks
# out of our internal code.
if display_banner is not DISPLAY_BANNER_DEPRECATED:
warn('mainloop `display_banner` argument is deprecated
since IPython 5.0. Call `show_banner()` if needed.',
DeprecationWarning, stacklevel=2)
while True:
try:
self.interact()
break
except KeyboardInterrupt as e:
print("\n%s escaped interact()\n" % type(e).__name__)
finally:
# An interrupt during the eventloop will mess up the
# internal state of the prompt_toolkit library.
# Stopping the eventloop fixes this, see
# https://github.com/ipython/ipython/pull/9867
if hasattr(self, '_eventloop'):
self._eventloop.stop()
Which is being reached because AlarmInterrupt is a subclass of
KeyboardInterrupt . I don't know why this doesn't happen then when,
say, mashing Ctrl-C. I guess because IPython installs its own SIGINT
handler or something.
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