import select
import signal
import threading
import time
import os


def handle_signal_slowly(a, b):
    time.sleep(1)

    
def send_signal():
    time.sleep(0.5)
    os.kill(os.getpid(), signal.SIGTERM)


read_end, write_end = os.pipe()
rlist, wlist, xlist = select.select([read_end], [], [], 1)
print(rlist)

signal.signal(signal.SIGTERM, handle_signal_slowly)
thread = threading.Thread(target=send_signal)
thread.start()
rlist, wlist, xlist = select.select([read_end], [], [], 1)
print(rlist)