signal_decorator.py

import signal
from time import sleep
from random import randint

def handler(signum, frame):
    print('signal:', signum)
    raise Exception('handler over')

def retry(retry_times=3, interval=5):
    def decorator(func):
        def wrapper(*args, **kw):
            for _ in range(retry_times):
                try:
                    signal.alarm(interval)
                    func(*args, **kw)
                    signal.alarm(0)
                    break
                except Exception as err:
                    print(err)
                    print('Time out')
                sleep(interval)
        return wrapper
    return decorator

@retry(retry_times=5, interval=3)
def random_sleep():
    n = randint(0, 5)
    print('sleep for %d seconds' % n)
    sleep(n)
    print('wake up')

if __name__ == '__main__':
    signal.signal(signal.SIGALRM, handler)
    random_sleep()