time.sleep() immediately returns when a signal is received

sigabrt.py

import time
import signal

def abrt_handler(signum, frame):
    print "Hey I catched a signal {}".format(signum)

signal.signal(signal.SIGABRT, abrt_handler)

while True:
    time.sleep(5)
    print "... stil sleeping"

To test it once:

pkill -ABRT -f sigabrt.py

And for the more violent version:

while [ 1 ]; do pkill -ABRT -f sigabrt.py; done

(and Ctrl+C to stop, since SIGINT is not catched)