Python snippet to add a SIGINT signal handler (i.e. CTRL+C) that prints a traceback and offers to start pdb

debug_on_sigint.py

import signal

def may_debug_handler(sig, frame):
    # allow double CTRL+C to really break interrupt:
    signal.signal(signal.SIGINT, signal.default_int_handler)

    c = input('(d)ebug? (i)nterrupt? ')
    print 'got:', c
    if c == 'd':
        breakpoint()
    elif c == 'i':
        return signal.default_int_handler(signal, frame)
    # restore this handler:
    signal.signal(signal.SIGINT, may_debug_handler)

signal.signal(signal.SIGINT, may_debug_handler)