import sys
import time
import threading


sys.setcheckinterval(17)


class C:
    def __del__(self):
        try:
            t = threading.Thread(target=lambda: 1+1)
        except:
            pass
        else:
            t.start()


cc = [C() for _ in range(10)]

def worker():
    while True:
        cc = [C() for _ in range(3)]
        try:
            raise 1/0
        except:
            time.sleep(0.001)


for _ in range(10):
    t = threading.Thread(target=worker)
    t.daemon = True
    t.start()


time.sleep(.1)