Better handling of KeyboardInterrupt in cmd.Cmd command line interpreter

Question

While using python\'s cmd.Cmd to create a custom CLI, how do I tell the handler to abort the current line and give me a new prompt?

Here is a minimal example:

Answer 1

You can catch the CTRL-C signal with a signal handler. If you add the code below, the interpreter refuses to quit on CTRL-C:

import signal

def handler(signum, frame):
    print 'Caught CTRL-C, press enter to continue'

signal.signal(signal.SIGINT, handler)

If you don't want to press ENTER after each CTRL-C, just let the handler do nothing, which will trap the signal without any effect:

def handler(signum, frame):
    """ just do nothing """