How to ignore KeyboardInterrupt in python?

Question

I'am writing console program. I want that save flow may break with Cntr-c only after answer on question: Do you really want break it?

def sigint_handler(signal, frame):
    try:
        Exit = (str(raw_input("Break ? Y/N")))
        if Exit == "Y" or Exit=="y":
            raise KeyboardInterrupt()
    except KeyboardInterrupt:
        raise KeyboardInterrupt()
    except Exception as e:
        pass

signal.signal(signal.SIGINT,sigint_handler)
i=0

while i<1000:
    i=i+1
    print "%d\n"%i
    sleep(0.5)

It's fail if I try cntl+c instead of Y:

71

72

73

74

75

^CBreak ? Y/Ny

File "/home.local/valerys/rde_1_3/rdepyui/bin/../api/cli.py", line 48, in sigint_handler Exit = (str(raw_input("Break ? Y/N"))) RuntimeError: can't re-enter readline

Salvatore Avanzo · Accepted Answer · 2015-04-02 08:00:40Z

3

Why do you make a re-raise of KeyboardInterrupt in the except block? In this way you catch the first KeyboardInterrupt but you don't have another try/except block for catching the second. Maybe a better solution is to call

try:
    Exit = (str(raw_input("Break ? Y/N")))
    if Exit == "Y" or Exit=="y":
        raise KeyboardInterrupt()
except KeyboardInterrupt:
    sys.exit()

for a clean exit strategy. I hope this can help you.

answered Apr 2, 2015 at 8:00

Salvatore Avanzo

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3 Comments

Pynchia Over a year ago

why not exiting directly, without raising the exception?

Salvatore Avanzo Over a year ago

@Pynchia : I suppose that this exception raise is needed to other purpose not shown in this simplified version of code but, other this, I don't see any reason to raise this exception.

Valeriy Solovyov Over a year ago

It's CLI and I want that user doesn't cancel execution of program flow.

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